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Unread 05-30-2011, 10:41 PM   #1
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1981 CJ7 
Join Date: Feb 2011
Location: Birmingham, AL
Posts: 7

I have been having problems with my voltage and cranking on my 1981 CJ7. I installed a new battery, solenoid, starter, and alternator, which fixed the cranking problem, but now whenever the engine bogs down the volt meter will go to zero the radio, dash lights and sometime even the headlights will go out. As soon as I race the engine the volts come back and everything else. Could I have gotten a bad alternator? Would welcome any suggestions. Thanks,

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Unread 05-31-2011, 02:55 AM   #2
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1977 CJ7 
Join Date: Aug 2010
Location: Lucama, North Carolina, North Carolina
Posts: 569
check all your grounds first!!!
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Unread 05-31-2011, 04:47 AM   #3
John Strenk
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1976 CJ5 
Join Date: Feb 2005
Location: Shalersville Ohio
Posts: 14,603
Go to Zero? That's a big drop. You have a poor connection someplace. Maybe a bad cable or crimp.

I would pull apart all the terminal connections and inspect them for loose or corroded contacts. Check from the starter solenoid to the firewall from the firewall to the ignition switch from the ignition switch to the fuse box. Look for loose connections, corroded wires, Overheating.

Next time you have a failure, attach one lead of a DVM to the POS (+) on the battery. Run the other test lead down the wire. Any place you have any voltage showing is a bad connection and needs to be fixed. If it really goes to Zero, you could probably use a test light. A DVM wll give you a better look at poor connections.

Wires are made up of many strands of wire and you only need 1 strand for voltage but all of them to carry enough current.

And yes check your grounds, they are part of the circuit also.
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Unread 05-31-2011, 05:02 AM   #4
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1981 CJ7 
Join Date: Jul 2009
Location: Bali, Indonesia
Posts: 5,197
Sounds like your major leads from the battery are knackered, either teh connectors themselves or the cables are corroded. cheap and eaily available generic cables will transform your electrics.
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