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Old 08-04-2015, 01:30 PM   #1
LTb1ow
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Alternator Voltage Sensing

CS144 alternator, in a 95 LT1 car.

Can I take the DC voltage sensing lead and run it to the battery post? From everything I have come across this seems perfectly doable.
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Old 08-04-2015, 02:27 PM   #2
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does your battery cable go to a junction somewhere, like the fuse/relay box?

what problem are you having?
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Old 08-04-2015, 02:32 PM   #3
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Alternator has a 1/0 wire to battery, battery has a 1/0 to starter stud, accessory relay panel has 1/0 to starter stud, alternator housing has 1/0 to chassis ground, battery ground has 1/0 to chassis ground.

Issue is, when hot, voltage seems to plummet and its been a bothersome issue for awhile. It seems the alternator cannot stabilize the voltage spikes so figured sticking POR at battery would help bump voltage out of alternator.
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Old 08-04-2015, 04:26 PM   #4
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is that how it was run factory? Specifically starter to replay/distribution block? Battery in trunk?

No engine to chassis ground?
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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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Old 08-05-2015, 06:24 AM   #5
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Nothing close to factory anymore.

Battery in trunk, engine/alternator share a large 1/0 ground to chassis. Starting isn't an issue so I feel ground is fine engine to chassis.

When fans kick on voltage drop is horrendous and I wanna do what I can to fix it.

Basically
http://www.madelectrical.com/electri...esensing.shtml

Would love to toss the POR at battery in trunk and have alternator run slightly more voltage
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Old 08-05-2015, 07:45 AM   #6
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is it only on fan start up or whenever they are running? two fans i assume, how many relays? do they have low & high speed settings? of so how is that wired?
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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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Old 08-05-2015, 07:52 AM   #7
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Fans are not OEM wired with half voltage/three relay

Relay for each, PCM triggers high or low based on temps. IMO when fans and pumps are running, battery is discharging.
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Old 08-05-2015, 08:16 AM   #8
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ok so not just a spike. I'd have used the 3 relay setup but you probably have a reason you didn't go that way. either way that does not seem to be an issue here.
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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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Old 08-05-2015, 08:43 AM   #9
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Quote:
Originally Posted by BonzoHansen View Post
ok so not just a spike. I'd have used the 3 relay setup but you probably have a reason you didn't go that way. either way that does not seem to be an issue here.
Yea, I have been down this road, actually never got back from down it

I have done as much as I can think of to negate the issue and it persists. Down and dirty method would be to hook 1/0 from the relay board straight to alternator instead of battery. But this would not pass tech and allow for all electrical to run with cutoff switched off.

Other thing I can perhaps think of is internal voltage regulator is dead in alternator, but that is a guess based on heat/load combos.
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