Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

Still not charging right...

Old Aug 22, 2004 | 10:21 AM
  #1  
ponykiller1992's Avatar
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From: Ohio
Car: 89 formula 350
Engine: 350 TPI
Transmission: Stock 700r4
Still not charging right...

Well, had the Alt tested, it was ok. Had the batt tested again, tunrs out it was bad. So, I got a new battery, charged it up good, started the car, and I still have 12 volts. The volts dont go down when I put load on it (well, they go down, but it comes back up). I am really confused on this. I dont know why I only have 12 volts. I check all my wires, and they look ok. What the hell can be causeing this?
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Old Aug 22, 2004 | 10:27 AM
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From: Gardnerville, Nv.
Car: 00 Camaro SS
Engine: 5.7
Transmission: 6 speed
Are you going off of the volt gauge in the car?It could be wrong.I would check it at the back of the alt.My old t/a did the same thing but it was intermittent.It ended up being the voltage regulator in the alt.
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Old Aug 22, 2004 | 10:28 AM
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From: conway, s.c.
Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
Are you reading the voltage from the battery terminals or the voltage guage while you have the car running?
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Old Aug 22, 2004 | 08:48 PM
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From: Ohio
Car: 89 formula 350
Engine: 350 TPI
Transmission: Stock 700r4
Alt is good, puts out 14.2 volts according to the tester at AZ.

I am waiting to get a vom, so I am going by the aftermarket voltmeter I have in the car.
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Old Aug 23, 2004 | 07:05 AM
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From: Warrington, PA USA
Car: "02 z-28
Engine: LS-1
Transmission: 4L60E
While you are waiting check the fuse in the fuse panel marked "chg/fan". Upper right on inside fuse block.
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Old Aug 23, 2004 | 09:26 AM
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From: conway, s.c.
Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
On his car it would just be marked "FAN" and is a 20 AMP fuse that also covers the Coolant Fan Relays. Good call Danno!!
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Old Aug 23, 2004 | 10:31 PM
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From: Ohio
Car: 89 formula 350
Engine: 350 TPI
Transmission: Stock 700r4
There is no fuse in the fan one, I took it out when I hooked a manual switch to the fan, could this be the prob? It has been out for months, this prob only started 2 weeks ago.

And yes, it had 14.2 volts under load.
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Old Aug 23, 2004 | 10:43 PM
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From: conway, s.c.
Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
Originally posted by ponykiller1992
There is no fuse in the fan one, I took it out when I hooked a manual switch to the fan, could this be the prob? It has been out for months, this prob only started 2 weeks ago.

And yes, it had 14.2 volts under load.
The "FAN" fuse is what that brown (tan/white) wire in the alternator connector goes to. Put a fuse in it, if it doesn't work you've only wasted about 20 seconds of your time. If it does work you will be a very happy camper.
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Old Aug 24, 2004 | 01:30 PM
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From: Ohio
Car: 89 formula 350
Engine: 350 TPI
Transmission: Stock 700r4
There is now brown wire on my ALT, just a red wire and a black wire on a connector, and a thick red wire that goes to a screw on on the back.

I put the fan fuse in, no change.

I used a DMM at the wires coming off the ALT and off the Batt, both read 12.24 according to the DMM. I also checked at the starter, and again, I had 12.24. Now what?
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