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04-21-2008, 09:48 PM
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#1
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Join Date: Jan 2008
Location: Jersey City, NJ
Posts: 622
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Fan switch keeps frying
i wired both fans to a switch a few weeks ago. the first time i did it with 14 guage wire. the switch would get real hot real quick eventually frying the switch. it happened to 3 switches. finally i rewired it with 12 guage wire and it seemed fine til today when i almost got into an accident from the smoke of burning wires. what the hell is going wrong? i know it's wired right. do i need a higher amp switch? is wiring both fans to one switch too much? too many amps?
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1987 IROC-Z L98 T tops
sold
2001 Pontiac Grand Am SE V6 (currently for sale PM me for details)
Last edited by JerzyIroc; 04-21-2008 at 09:49 PM.
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04-21-2008, 09:50 PM
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#2
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Join Date: Feb 2008
Location: Linden NJ
Posts: 587
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you should be running the switch to a relay and the relay to the fans, the fans pull too many amps for a switch alone esp dual fans....your not at federated anymore
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04-21-2008, 10:03 PM
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#3
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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Search this forum, there are a bunch of wiring diagrams posted. Get a real fan switch & some relays.
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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04-21-2008, 10:06 PM
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#4
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Join Date: Jan 2007
Posts: 5,623
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sounds to me like you have the switch on the hot wire(+) you need it to be on the ground.
__________________
2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10
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04-21-2008, 10:07 PM
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#5
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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Quote:
Originally Posted by bubba428
sounds to me like you have the switch on the hot wire(+) you need it to be on the ground.
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It's still all part of the circuit. He's not using realys, positive of negative is meaningless for his issue.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
Last edited by BonzoHansen; 04-21-2008 at 10:07 PM.
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04-21-2008, 10:08 PM
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#6
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Join Date: Feb 2008
Location: Linden NJ
Posts: 587
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Quote:
Originally Posted by bubba428
sounds to me like you have the switch on the hot wire(+) you need it to be on the ground.
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either way your still gonna pull too much amperage for a switch esp that he has dual fans on 1 switch
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04-21-2008, 10:11 PM
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#7
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Join Date: Jan 2007
Posts: 5,623
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Quote:
Originally Posted by BonzoHansen
It's still all part of the circuit. He's not using realys, positive of negative is meaningless for his issue.
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depends on how its wired....it sounds like its a hot wire set up...meaning the wires go strait to the battery. If its run though a ground and he gets a higher tolerance switch there won't be an issue
__________________
2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10
Last edited by bubba428; 04-21-2008 at 10:12 PM.
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04-21-2008, 10:18 PM
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#8
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11 second club / Moderator
Join Date: Aug 2004
Location: West Berlin, NJ
Posts: 7,148
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Quote:
Originally Posted by bubba428
depends on how its wired....it sounds like its a hot wire set up...meaning the wires go strait to the battery. If its run though a ground and he gets a higher tolerance switch there won't be an issue
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He needs to run relays, which are designed for this purpose. Hes pulling too much current through the switch.
Weather he has a hot wire set up, cold wire setup whatever you want to call it.
__________________
2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
1996 Trans Am WS6 •Pacesetter Longtubes •Strange 12 Bolt •Spohn Suspension •11.152 @ 123.85
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04-21-2008, 10:21 PM
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#9
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Join Date: Jan 2008
Location: Jersey City, NJ
Posts: 622
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i'm runnun power from the bat to the switch. the two power wires from the fans to the switch. ground the switch to under the dash. and the fans are grounded to the chassis
__________________
1987 IROC-Z L98 T tops
sold
2001 Pontiac Grand Am SE V6 (currently for sale PM me for details)
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04-21-2008, 10:24 PM
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#10
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Join Date: Feb 2008
Location: Linden NJ
Posts: 587
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Quote:
Originally Posted by JerzyIroc
i'm runnun power from the bat to the switch. the two power wires from the fans to the switch. ground the switch to under the dash. and the fans are grounded to the chassis
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your lucky your cars not on fire...haha jk but seriously we gotta get you a relay setup.
run b+ to the 30 on the relay preferably fused or breaker or something
run switched power to 85
run ground to 86
and run power to fan from the the Normally Open (i think 87a)
i would put relay on the firewall somewhere
Last edited by 91DropTop; 04-21-2008 at 10:28 PM.
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04-21-2008, 10:26 PM
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#11
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Join Date: Jan 2007
Posts: 5,623
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I have mine set up like that and it didn't fry my switch yet?
__________________
2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10
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04-21-2008, 10:31 PM
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#12
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Join Date: Jan 2008
Location: Jersey City, NJ
Posts: 622
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lmao thanks.. ya i gotta do a relay setup. argh.
__________________
1987 IROC-Z L98 T tops
sold
2001 Pontiac Grand Am SE V6 (currently for sale PM me for details)
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04-21-2008, 10:32 PM
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#13
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Join Date: Jan 2008
Location: Jersey City, NJ
Posts: 622
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you have both fans wired?
__________________
1987 IROC-Z L98 T tops
sold
2001 Pontiac Grand Am SE V6 (currently for sale PM me for details)
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04-21-2008, 10:33 PM
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#14
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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I'd run one relay per fan, or a total of 3 if you want to get fancy.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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04-21-2008, 10:36 PM
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#15
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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04-21-2008, 10:40 PM
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#16
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Join Date: Feb 2008
Location: Linden NJ
Posts: 587
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Quote:
Originally Posted by BonzoHansen
I'd run one relay per fan, or a total of 3 if you want to get fancy.
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fancy would be getting a new temp switch in the block and having that control the relay instead of a dash switch, like stock...what a concept hahaha
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04-23-2008, 07:28 AM
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#17
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Join Date: Jan 2008
Location: Jersey City, NJ
Posts: 622
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Quote:
Originally Posted by 91DropTop
fancy would be getting a new temp switch in the block and having that control the relay instead of a dash switch, like stock...what a concept hahaha
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HA. **** fancy. i barely wanna wipe my ass when i **** because its too much work lol. jk. nah im fine just putting it to a switch. So if i were to use two relays im guessing id have to use two switches?
__________________
1987 IROC-Z L98 T tops
sold
2001 Pontiac Grand Am SE V6 (currently for sale PM me for details)
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04-23-2008, 07:38 AM
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#18
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Join Date: Feb 2006
Posts: 1,385
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you could use one switch and set both to ground through one switch << also a 5 amp plastic rocker is not the kind of switch everyone is talking about < you will need a real metal type 10 or even 20 amp type Jegs sells or an old type hardwear store will have you can run two 30 amp fans from a 10 amp metal switch by using the ground on the relays as the driver in that way all the load is on the relay not the switch -- jz
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04-23-2008, 09:28 AM
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#19
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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If you get a two pole relay you can get away with just using one, but you definetly should not be running high amp accessories like fans without a relay.
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04-23-2008, 11:06 AM
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#20
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Join Date: Jan 2008
Location: Jersey City, NJ
Posts: 622
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wait so if i use one switch but two relays im gonna splice wires going from the relay to the switch together? and just ground each relay out? im way off arent i lol
__________________
1987 IROC-Z L98 T tops
sold
2001 Pontiac Grand Am SE V6 (currently for sale PM me for details)
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04-23-2008, 11:39 AM
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#21
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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Yes, 1 switch is all that is needed. You can split the trigger circuit to each relay.
Now is the time to get a real fan switch and not a toggle. You can keep the toggle for back up if you like.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
Last edited by BonzoHansen; 04-23-2008 at 12:05 PM.
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04-23-2008, 03:04 PM
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#22
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Join Date: Jan 2008
Location: Jersey City, NJ
Posts: 622
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wow. thats awesome man. you guys rock
__________________
1987 IROC-Z L98 T tops
sold
2001 Pontiac Grand Am SE V6 (currently for sale PM me for details)
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04-23-2008, 03:36 PM
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#23
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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Summit sells simple kits with a fan switch and one relay, you can get a 2nd relay in a local parts store. Do you have AC? You have to splice that into the circuit too.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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07-29-2008, 07:00 PM
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#25
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Join Date: Jan 2008
Location: Jersey City, NJ
Posts: 622
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ok so i know a lot of you guys are gonna be like wtf since this post is about 3 months old buutt... i finally got around to doing the switch a few weeks ago. (yes it took me that long to get time) and im not gettin it. i have bat going to 30, the fan going to 87, the switch going to 85, and ground going to 86. nothing. still wont work. WTF?! its a brand new relay and switch too..
__________________
1987 IROC-Z L98 T tops
sold
2001 Pontiac Grand Am SE V6 (currently for sale PM me for details)
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