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Author Topic: Battery won't stay charged  (Read 16595 times)

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GTRS Fiero

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Battery won't stay charged
« on: March 07, 2018, 09:35:29 pm »
Posted for oldone:
all right I give up my 86 gt keeps running the battery down. nothing left on, I charge it up the next day I unplug the charger and the next day its dead?  help

GTRS Fiero

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Re: Battery won't stay charged
« Reply #1 on: March 07, 2018, 09:37:09 pm »
I would suggest that you connect your multi-meter inline between the battery and the negative terminal, set the multi-meter to AMPs, then see what the meter shows.  You can pull fuses one by one, until there is a change.  When there is a change, you've found your culprit.
« Last Edit: March 07, 2018, 09:48:23 pm by GTRS Fiero »

Fierofool

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Re: Battery won't stay charged
« Reply #2 on: March 07, 2018, 09:43:22 pm »
When you finish charging, feel your headlight motors to see if they're hot. 
There are three kinds of men:

1.    The ones that learn by reading.
2.    The few who learn by observation.
3.    The rest of them have to pee on the electric fence and find out for themselves.    Will Rogers

Fierofool

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Re: Battery won't stay charged
« Reply #3 on: March 08, 2018, 01:30:44 pm »
If your headlights motors aren't hot, unplug the oil pressure sending unit and let the car sit overnight.  They can short out and because they have constant 12V to them, they can drain the battery quickly.  Happened to my 86. 
There are three kinds of men:

1.    The ones that learn by reading.
2.    The few who learn by observation.
3.    The rest of them have to pee on the electric fence and find out for themselves.    Will Rogers

Raydar

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Re: Battery won't stay charged
« Reply #4 on: March 08, 2018, 01:40:02 pm »
...unplug the oil pressure sending unit and let the car sit overnight.  They can short out and because they have constant 12V to them, they can drain the battery quickly.  Happened to my 86.

Same thing happened to mine. And it was a brand new sending unit.
...

oldone

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Re: Battery won't stay charged
« Reply #5 on: March 08, 2018, 05:06:19 pm »
its to cold out right now. maybe when it gets warmer I can check it out.
the world is a sh t sandwich and everyday is another little bite

Fierofool

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Re: Battery won't stay charged
« Reply #6 on: March 17, 2018, 10:27:42 pm »
Dewey, did you get a chance to check the headlight motors or unplug the oil pressure sending unit? 
There are three kinds of men:

1.    The ones that learn by reading.
2.    The few who learn by observation.
3.    The rest of them have to pee on the electric fence and find out for themselves.    Will Rogers

oldone

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Re: Battery won't stay charged
« Reply #7 on: March 19, 2018, 09:11:34 pm »
all I`ve done is charge the battery and then let it sit a couple days and then hook up the car again and it started right up. not the battery. Charlie I don`t know where the oil sending unit is.
the world is a sh t sandwich and everyday is another little bite

GTRS Fiero

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Re: Battery won't stay charged
« Reply #8 on: March 19, 2018, 09:20:32 pm »
Does this help?


oldone

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Re: Battery won't stay charged
« Reply #9 on: March 20, 2018, 09:06:16 pm »
thanks
the world is a sh t sandwich and everyday is another little bite

GTRS Fiero

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Re: Battery won't stay charged
« Reply #10 on: April 28, 2018, 10:46:04 am »
Did you get this resolved?

oldone

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Re: Battery won't stay charged
« Reply #11 on: April 29, 2018, 12:22:13 pm »
no still won`t hold a charge.
the world is a sh t sandwich and everyday is another little bite

GTRS Fiero

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Re: Battery won't stay charged
« Reply #12 on: April 29, 2018, 12:52:00 pm »
You could always connect an amp meter in series with the battery, check the reading for parasitic drain, then pull fuses, one at a time to check for changes.  If still no change, disconnect the oil sending unit, then the starter.

Fierofool

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Re: Battery won't stay charged
« Reply #13 on: April 29, 2018, 01:15:58 pm »
Be sure your interior lights are off.  Close the door and check.  I just helped someone else and after trying all the above suggestions, it was the dome light was on.
There are three kinds of men:

1.    The ones that learn by reading.
2.    The few who learn by observation.
3.    The rest of them have to pee on the electric fence and find out for themselves.    Will Rogers

GTRS Fiero

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Re: Battery won't stay charged
« Reply #14 on: April 29, 2018, 01:39:42 pm »
The map lights?  Good idea.  Also, the ajar switches could be bad.