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1994 Jeep Cherokee Possible Electrical Short
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TedN
New User
Apr 1, 2012, 10:41 AM
Post #1 of 4
(2466 views)
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1994 Jeep Cherokee Possible Electrical Short
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Hello All :
I have a 1994 Jeep Grand Cherokee V-8 5.2 L with approx. 100,000 miles. The battery drained itself overnight and car would not start this morning. I had battery tested at Auto Zone this morning and it is ok. When battery is fully charged the car starts. Alternator is working.
It must be an electrical short somewhere? Any suggestions as to what could be shorting out?
Thanks.
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Discretesignals
Ultimate Carjunky
/ Moderator
Apr 1, 2012, 10:57 AM
Post #2 of 4
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Re: 1994 Jeep Cherokee Possible Electrical Short
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It's probably not a short draining your battery, but a parasitic draw from something staying on with the key off. You'll need to do a parasitic draw test to figure out which circuit is drawing an excessive amount of amps. All vehicles that have computers, clocks, and other devices that use current when the vehicle is off will draw from the battery. This is acceptable to a certain point. The rule of thumb is if the draw is over .050 amps, you have a problem.
watch this vid for more info:
http://www.youtube.com/watch?v=KF1gijj03_0
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Apr 1, 2012, 10:58 AM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 1, 2012, 11:18 AM
Post #3 of 4
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Re: 1994 Jeep Cherokee Possible Electrical Short
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Great video with good instructions but he never once talks about timers through the whole video.
Here's my set of instructions
You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
Apr 1, 2012, 11:23 AM
Post #4 of 4
(2440 views)
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Re: 1994 Jeep Cherokee Possible Electrical Short
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He mentions timers at the end of his video. That's one discrepancy I found too. When you connect your meter in series with the battery cable, you don't want to cut power off because it will reset modules making them wake up after they were sleeping when you connect your meter up. You want to run a bypass to keep battery power from being disconnected from the electrical system while connecting your meter. Some people use a battery disconnect for this or you can use HT's approach.
Another thing is don't change the scale on your meter or rotate the knob while it is connected. Only change ranges with it disconnected and your bypass in place.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Apr 1, 2012, 11:26 AM)
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