1982 Toyota Supra Charging Problem

1982 TOYOTA SUPRA
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CMNETWORX
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  • 7 POSTS
I have an 1982 Supra, and The charging system will not charge, (same as a previous post, 1989 Toyota, Supra Turbo) I have replaced the alternator 2 times, replaced both my ground and lead cables, replaced the in-dash relay (they called it the charge-lamp relay), Replaced the battery, basically everything I can think of. The alternator is a lifetime warranty, and very expensive, I didnt go cheap on this, I have learned in the past from that, but I will be trying my 3rd alternator. Is it possible that I have had 2 bad voltage regulators? or am I missing something here..
Feb 10, 2006 at 8:09 AM
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2CARPRO JACK
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Check the resistance of the charge wire to the battery
Feb 14, 2006 at 9:48 AM
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CMNETWORX
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  • 7 POSTS
Resistance came back at 0 on charge wire and ground wires. I actually ended up testing voltage to the regulator on the back of the alternator and It was getting readings (I didnt think it was) and figured out it was just another bad voltage regulator.. Replaced the alt since the regulator is built in, and no problems since. Wierd. I would think that the regulators were more dependable than that..
Feb 14, 2006 at 9:58 AM
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Suggested Repair

Check resistance of the charge wire to the battery and the ground wires. If continuity is good, test the built-in voltage regulator; replace the alternator if the regulator has failed.

Conversation Summary

A 1982 Toyota Supra would not charge despite two alternators, new battery cables, a charge-lamp relay, and a battery. An expert advised checking charge-wire resistance to the battery, which tested at zero along with the grounds. Voltage at the regulator confirmed another failed built-in regulator; replacing the alternator resolved the charging problem.

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