Need Charging system shecmatic
Thread Starter
Racer
Joined: Jun 2011
Posts: 319
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From: Harrison Ohio
Need Charging system shecmatic
got the 82 running and was charging fine then stopped charging. Alt testing at 14+volts , gage showing 13 and apprx 13 at the battery. I am thinking i must have an open between the alt & fuse box.
Thanks
Thanks
Pro
Joined: May 2011
Posts: 581
Likes: 5
From: BC
Can't find a wiring diagram, but am reasonably certain the batt lead on the alt makes it's connection to the battery at the starter pos cable terminal. I believe you will find a couple of fusible links there, which is most likely the source of your problem.
Steve g
Steve g
Thread Starter
Racer
Joined: Jun 2011
Posts: 319
Likes: 0
From: Harrison Ohio
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
13 at the battery could mean the battery is very low (it is a big sponge), bad battery,bad connections at the battery or your not getting a good reading from your voltmeter
I believe the 82 has both wires-the usual charging wire from the alt to the starter AND the one that goes direct from the alt to the battery.
Thread Starter
Racer
Joined: Jun 2011
Posts: 319
Likes: 0
From: Harrison Ohio
I will run a wire and bypass the oem wire to and see if that cures my problem. I assume if it were chafing i would have a short i am thinking break in the wire.
When i bought the car the guy gave me all his receipts for work. So far every problem i have had was addressed by a local mechanic at one time. I am thinking he aint much of a mechanic if i can figure it out, he must have money cause he sure put the screws to the previous owner.
When i bought the car the guy gave me all his receipts for work. So far every problem i have had was addressed by a local mechanic at one time. I am thinking he aint much of a mechanic if i can figure it out, he must have money cause he sure put the screws to the previous owner.
Pro
Joined: May 2011
Posts: 581
Likes: 5
From: BC
If your showing 14 at the alternator , the alt is charging.
13 at the battery could mean the battery is very low (it is a big sponge), bad battery,bad connections at the battery or your not getting a good reading from your voltmeter
I believe the 82 has both wires-the usual charging wire from the alt to the starter AND the one that goes direct from the alt to the battery.
13 at the battery could mean the battery is very low (it is a big sponge), bad battery,bad connections at the battery or your not getting a good reading from your voltmeter
I believe the 82 has both wires-the usual charging wire from the alt to the starter AND the one that goes direct from the alt to the battery.
Steve g
Thread Starter
Racer
Joined: Jun 2011
Posts: 319
Likes: 0
From: Harrison Ohio
You can't have 14 at the alt and 13 at the battery if they're connected together (low battery theorey). Clipping the test wire on the alt batt post instead of the batt would be akin to using a longer wire lead on your voltmeter. Has to be an open (high resistance) circuit between battery and alt.
Steve g
Steve g
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Race Director
Joined: May 2006
Posts: 16,528
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From: Dayton, Ohio
I don't have an 82 here to confirm but if I remember right that junction point is the large pos terminal on the back of the alt ,both wires bolt up there. That's what's making it difficult for me to understand the OPEN theory.
edit - how does the connection look where the neg battery cable bolts to the frame ?
edit - how does the connection look where the neg battery cable bolts to the frame ?
Last edited by ...Roger...; Oct 4, 2011 at 11:51 AM.
Thread Starter
Racer
Joined: Jun 2011
Posts: 319
Likes: 0
From: Harrison Ohio
I don't have an 82 here to confirm but if I remember right that junction point is the large pos terminal on the back of the alt ,both wires bolt up there. That's what's making it difficult for me to understand the OPEN theory.
edit - how does the connection look where the neg battery cable bolts to the frame ?
edit - how does the connection look where the neg battery cable bolts to the frame ?
Good ? where is it i am a newbie
Pro
Joined: May 2011
Posts: 581
Likes: 5
From: BC
Need to find a wiring diagram. I can't remember a (factory) side terminal positive batt cable having a smaller (10-12 ga) wire in the terminal or any gm with two wires on the alt pos terminal. I know that in 69 the 10 ga wire from the alt went to the horn relay. Don't recall if the splice was along the length of the wire or in the terminal at the relay end. You might want to check there.
Steve g
Steve g
Thread Starter
Racer
Joined: Jun 2011
Posts: 319
Likes: 0
From: Harrison Ohio
Found it to be an intermittent connection in the alt, if smack the crap out of it it works
...... Quality part from duralast.
Thanks for all the replies.
Now the next project passenger side door handle does not move far enough to disengage the door latch.
...... Quality part from duralast.Thanks for all the replies.
Now the next project passenger side door handle does not move far enough to disengage the door latch.
