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95 montero transmission shift problems + overheating + battery not charging

Orver heats in gear when driving + voltage from alternator low and drops when driving + stuck in passing gear won't shift All problems started around same time. It is not the thermostat, water pump, transmission fluid or filter, not the battery or alternator. what could it be?

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  • John Brainerd Feb 19, 2012

    puts out OK voltage when first started, can idle 20 minutes, put it in gear.
    the voltage drops, and guage goes to hot quickly. Put it in park, the temp guage drops, and the voltage almost recovers.

  • John Brainerd Feb 19, 2012

    It is definitly electrical in nature, The battery is new alternator new, and tested twice.
    the starter is new. I think it might be the ECM, but I don;t want to spend hunderds on a guess. I don't know if this vehical has a separate transmission computer or not?

  • John Brainerd Feb 19, 2012

    Thanks for a solution, but I have done all those things, and them some, it's not mechancal it is electrical. Just getting too expensive to buy electrical parts on a guess.

  • John Brainerd Feb 24, 2012

    Problem solved! Bad or not enough ground.
    Added a ground wire directly from battery to engine,
    everything started working again.

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  • Cars & Trucks Master
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The first step is to see if the gauge are correct,low voltage can cause many problems, the first step is to make sure the coolant is full so check radiator, this is done when cold, if full then start the engine with a meter on the battery and watch the voltage, have someone put it into drive while holding brake. if voltage on meter starts to drop then give a little gas to rev engine and see if voltage goes up, if it does then you may have to low an idle but if the idle is ok then alternator is bad. also have the battery tested to make sure its good, just because it starts the truck does not mean its good. the next thing is to look at the overheating problem. if the cooling system is full and it runs hot then that must be looked at,when the truck is starting to overheat we assume it is due to gauge, but this sounds like it may be low coolant or low voltage or idle is to low because when you put it in park it drops. start with these checks and let me know the results. good day.

Posted on Feb 19, 2012

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