1992 E36 325 Coupe Charging/starting issues(FIXED) - Page 2

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Thread: 1992 E36 325 Coupe Charging/starting issues(FIXED)

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    #11
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    Also, just bumped car off.

    its been running for about 3mins. batt voltage is 12.7v on tickover.....13.4v revving approx 2k.

    just touched the alternator casing and its red hot! is this normal??

    Will remove and fully charge battery then run voltage drop test in morning.

    Also checked the boot light but this went out when boot shut :-(

    Dan
     
     

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    #12
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    Quote Originally Posted by dj4man View Post
    is this with engine running or off? Will try this when batt charged up.

    Cheers
    With engine off,

    You are checking for a drain, so want the car in the same state as when it's locked up at night, everything turned off, doors closed e.t.c.
     
     

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    #13
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    Quote Originally Posted by dj4man View Post
    Also, just bumped car off.

    its been running for about 3mins. batt voltage is 12.7v on tickover.....13.4v revving approx 2k.

    just touched the alternator casing and its red hot! is this normal??

    Will remove and fully charge battery then run voltage drop test in morning.

    Also checked the boot light but this went out when boot shut :-(

    Dan
    12.7 volts means alternator isn't charging.

    That is just the battery voltage showing. The alternator shouldn't be red hot either, you need a new one if you were checking voltage from the rear of the alternator
     
     

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    #14
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    As above, new alternator methinks
     
     

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    #15
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    I carried out a voltage drop/drain test.......

    something is sucking a whopping 3.2 amps out of the battery and that was with only a booot light been on. with the bulb removed, it went to 3.1 amps!!!

    Maybe?!?! the short is within the alternator.

    I'm going to get it properly checked and replaced if required.
     
     

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    #16
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    You could disconnect the wiring at the rear of the alternator and see if the current drops.
    I've seen this before with alternators
     
     

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    #17
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    Quote Originally Posted by gildersol View Post
    You could disconnect the wiring at the rear of the alternator and see if the current drops.
    I've seen this before with alternators
    Classic fault with Rover 200's.
    Always used to replace alternators on those wil the same fault.
    Deard shorts inside the alternators, used to drain the batterys in a few hours
     
     

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    #18
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    Yep I would disconnect the alternator wiring and see if the draw goes down.
     
     

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    #19
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    Right, finished ealry today so measured battery again and getting a 4.2amp draw.

    disconnected the alternator live wire from back of alt and batt reading gives a 1.2amp draw.

    1.2amp?? this normal? only thing working will be the immo/alarm. car was unlocked too at this time.

    will try again now...with car locked.
     
     

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    #20
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    Take the smaller wires off the back of the alternator as well
     
     

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