Question about 1984 Toyota Cressida

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CHarging system does not charge, Battery and altenator both checfk good. Belt is tight, and main lead to alt has 12 volts. # prong connector has 2 leads that read 12vdc, and 1 that reads approx 11.5vdc

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  • tribeofwarne Feb 08, 2010

    The voltage on the battery reads approx 12.4vdc. With the lights on the voltage starts to drop untill the vehicle dies. The battery was checked and determined to be good. I removed the Alt and had it bench tested at the local parts store and they determined it to be in good working order. The main lead to the Alt is the same as at the battery running or not. The 3 leads on the connector were checked with the engine off.

  • tribeofwarne Feb 11, 2010

    my 84 cressida charging system seems to be intermittent. The last response was that maybe the charging relay is faulty. Does anyone know where that is or what it may look like. It supposedly is under the dash somewhere. I did find on the fuse block where there maybe a place for a relay, however, what appears in it's place looks like a copper jumper, with a mylar (Plastic)covering. (obviously from the factory that way). Thanks...

  • tribeofwarne Feb 11, 2010

    The main lead from the Battery reads the same as thr Battery. The 3 prong connector has 2 leads that read the same voltage however the 3 lead is down about 1 volt. At one point when the charging system appears to be working, I'm reading a good 14.5 volts and it maintains that with the lights and heater on. When it appears not to be working the reading on the battery starts to drop when running. and drops faster when lights and heater are on. Does anyone kow if the 3 prong connector is suppose to read 12 volts on all 3 or is one a ground. I also checked to see if there was a difference between when it was hot vs cold, and doesn't seem to make any difference.

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The problem I see is you have an intermittant issue. If the car was charging when you had the alternator tested then the test is reduntant.

You would have to test the alternator when its not charging. Having an intrmittant issue like this tells me you may have a bad alternator, and or regulator if its internal or a loose connection at the fuse box, or a bad PCM . Not sure what fuse, if any power it up. But when it is not charging and you still have 12 volts at the alternator then the other wires are regulated by the computer.

If you do not have 12v at the alternator when it is not charging then you have a 12v power source issue.

Posted on Feb 11, 2010

  • Susan Price Feb 11, 2010

    on further studying on your system I see your regulator is external from the alternator. My diagnostics say its adjustable. But being an 84 i would suggest just relacing it. .



    You could open the cover and inspect it and clean the contacts carefully. If things change at all I would replace it

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Please confirm that the connectors both read 12 volts else you might need some expert in charging system to service the charging system.

That is where the problem lies.

Good luck,

Posted on Feb 11, 2010

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What is the battery voltage while the engine is running at around 1500 RPM's? I see you have 12 volts running to the alternator assuming this was checked while the engine was off? Your alternator has a built in regulator and may be the cause of the system not charging. How was the alternator load checked??? Sorry for all the questions, but I need this info to help. No need to rate this post yet. Thanks.

Posted on Feb 08, 2010

  • GetMeOttaHere Feb 08, 2010

    Ok. If the battery and alt are good and test good under an electrical load test, then your charging relay is bad. It has been a while since I have worked on one of these vehicles, but I do remember a relay located under the dash, some where near the fuse panel/box. It is the only thing that can be wrong after reviewing the info and testing info given.

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