dead battery

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11-05-2010, 07:10 PM

#76

Borego

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Year: 1992

Model: Cherokee

Engine: 4.0L

Quote:

Originally Posted by ET JEEP

This sure is a mystery. With a .25 amp draw your battery should not die overnight. Did you try the test, removing IOD overnight? What was the result? Your alternator is good at 14 volts.

Im going to test over the weekend to see it thats the problem.
I other thing that Im going to test the locks maybe the are sticking.
Im going to go over it again, I just run a wire direct to the battery and
try that .

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11-06-2010, 08:28 AM

#77

bobvalli

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Year: 98

Model: Cherokee

Engine: 4.0l

Quote:

Originally Posted by ET JEEP

So the theory goes that the older vehicles with alternators and voltage regulators disconnecting the battery was not a problem as the VR could handle the load.

Now, with computer controlled vehicles and VR in the PCM disconnecting the battery could place a damaging load on the computer. So there are warnings not to do this. I just purchased a book on automotive electrics and the warning is there.

I am no expert and I do not intend to test the theory. My multimeter and my homemade voltage/continuity tester will work for me.

Thanks for that info. I know we're not Mythbusters, but I'd say this one's BUSTED. If this ever comes up for me, I'll definitely be breakin'' out the ol' meter rather than take the chance of damaging the PCM

Thanks again for the info

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11-06-2010, 05:02 PM

#78

Borego

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Year: 1992

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so far so good.
still the only draw is fromt the radio.
I went check everything and found nothing.
I removed that fuse IOD. Ran a power from the fuse panel.(turn signal)
Still the only draw is .25 from the radio. Ill try again over the weekend.

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11-06-2010, 05:11 PM

#79

bobvalli

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Year: 98

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Quote:

Originally Posted by Borego

Thanks for the update

You'll get it

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11-06-2010, 10:26 PM

#80

retreaded jeeper

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Year: 1993

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by bobvalli

Try using a light bulb between the - battery terminal and the - terminal of the battery. It will probably glow pretty bright. Pull fuses till it goes dim and then trace from that fuse. The bulb has to be a higher wattage lamp to eliminate false readings.

or a test light, they are pretty inexpensive. disconect the battery clip the tester on the post and stab the cable-you're all set

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11-11-2010, 06:27 AM

#81

Borego

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Year: 1992

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okay its all good so far.
i tryed the test light & nothing.
i tryed the meter & no draw only the radio memory.
i have stilled no plugged in the fuse for the iod. im
going to leave that fuse out, it seems to be the issue.
something gives me a draw when the vehicle is running with
that fuse pulged in. So away it goes never to return.

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11-11-2010, 07:20 AM

#82

ET JEEP

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Year: 1997

Model: Grand Cherokee

Engine: 4.0

You need to check to see what you lose with that fuse pulled. It provides power to a few items. Check you hazard lights, I may be wrong but I believe they work off the IOD.