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post #1 of 5 Old 09-27-2006, 07:13 PM Thread Starter
jy4wvu
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low voltage...

I have an 84 CJ7. I have replaced the alternator. I have replaced battery cables and a new battery. I have replaced the starter solenoid. When i use the headlights and/or heater, the voltage drops below 12 volts. If i drive for 30 minutes that way, the battery dies. Any help????
is there a voltage regulator external of the alternator??

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post #2 of 5 Old 09-27-2006, 07:29 PM
Bard
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Either way if you have a 4 or 6 cyl, you could have gotten a bad alternator, which could work for a short period of time. I have had this happen before. Take it off and have the parts store test it where you bought it. If it comes back negative, you have a bad ground somewhere which is drawing off the battery, but I think it is the alternator by the sounds of your problem.

85' CJ7 Laredo, 383 GM, Turbo 350, NP 203. SOA, 2" frame lift, 34" TSL swampers, Dana 30 open, AMC 20 w/ detroit locker, 4:10's, 1 Piece Mosers, 35" boggers to abuse when needed.
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post #3 of 5 Old 09-28-2006, 01:05 PM Thread Starter
jy4wvu
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i took alternator in for test....it is ok. i have re-ground everything. I have 2 wires on the alternator plug in...red and white. does the white go to ground??
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post #4 of 5 Old 09-28-2006, 06:24 PM
gosupes
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You might try upgrading to a larger gauge wire from the alt to the solenoid post also. I was losing about 4 volts with everything running and the stock 10awg wire. I installed a 2awg wire from a chunk of battery cable with some heavy copper terminals soldered on. No more loss.

1986 CJ7, 4.2 w/4.0 head, TFI-HEI hybrid ignition, Clifford manifold w/Holley 390 w/cold air intake, OBA, 4.5" lift, Woody CV shaft and Tattons in front, 4.10 gears - lunchbox in front, Truetrac in the back, twin-sticked, blower upgrade for running topless, trying to keep it simple.

It's just a Jeep, and if you don't wheel it once in a while, it's not even that.
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post #5 of 5 Old 09-29-2006, 03:54 AM
John Strenk
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Quote:
Originally Posted by jy4wvu
i took alternator in for test....it is ok. i have re-ground everything. I have 2 wires on the alternator plug in...red and white. does the white go to ground??
You mean it's not hooked to anything now and you got it working!?? Shazaam!!
Case of the alternator is ground the red heavy gauge wire comming out of the 2 wire plug goes to the output post. the other wire, normally brown or tan, conects back to the ignition switch. This is usually a thin fragle resistance wire that is usually pooly crimped into the terminal.
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