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08-04-2015, 02:30 PM
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#1
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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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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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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08-04-2015, 03:27 PM
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#2
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,152
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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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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; 08-04-2015 at 03:27 PM.
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08-04-2015, 03:32 PM
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#3
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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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.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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08-04-2015, 05:26 PM
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#4
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,152
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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?
__________________
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; 08-04-2015 at 05:26 PM.
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08-05-2015, 07:24 AM
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#5
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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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
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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Last edited by LTb1ow; 08-05-2015 at 08:12 AM.
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08-05-2015, 08:45 AM
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#6
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,152
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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?
__________________
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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08-05-2015, 08:52 AM
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#7
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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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.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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08-05-2015, 09:16 AM
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#8
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,152
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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.
__________________
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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08-05-2015, 09:43 AM
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#9
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Quote:
Originally Posted by BonzoHansen
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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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.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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