Alternator not charging - Team Camaro Tech
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post #1 of 3 (permalink) Old Aug 19th, 11, 02:22 AM Thread Starter
Dean
 
Join Date: Aug 2011
Location: Austin, tx
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Alternator not charging

I have a mid seventies alternator on my 67camaro 350. It is new. My battery keeps dying. The old one was wired as a one wire alt I suppose but thought it would be better to have it wired as the 3 wire. So I ran new wires. It seems now that it is not charging. I have also had a problem with a battery drain but I have determined that it was a relay causing the drain. My bat was charged ans installed. Now when I tested the system with the multimeter the volts read 12.5 at the battery and 12.7 at the back of the alternator post. I have the red wire from the plug in ran with a diode over to the relay at the wheelwell. The white wire is run to an idiot light and ignition on circuit. Anyone have an idea what my problem might be? Also my battery is located to the trunk. It is grounded to the bracket in the trunk that holds the latch for the trunk lid. The engineblock is on all metal engine mounts and I believe there is a bracket at the back of the engine block thatlooks like it is basically another motor mount to keep the engine from torquing.

67 Camaro
360 cubic inch 12:1
NOS
4.56 Detroit locker
6.70 1/8mile
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post #2 of 3 (permalink) Old Aug 19th, 11, 03:48 AM
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Re: Alternator not charging

Are you sure the wires at the alternator are correct. I know the two on top with the plug are easy to get backwards.

And here's a diagram I used...hope it helps.

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68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #3 of 3 (permalink) Old Aug 19th, 11, 05:00 AM
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Re: Alternator not charging

Along with Doug's excellent schematic, you should run a separate ground wire from engine block to battery.
You could also take a length of 12 AWG wire and go from alt term #2 (sense) and run it to either the positive fuse in the trunk or to electrical side of cutoff switch.

Running this long sense wire would be determined by the charging voltage across battery posts. If alt BATT post shows a voltage, and battery posts shows less than 0.4 volt difference, not worth the time to add the wire.

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