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post #1 of 2 (permalink) Old 12-18-08, 08:58 AM Thread Starter
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1996 ranger battery drain problem

I have a 1996 Ranger 4wd automatic, with an apparent parasitic battery drain problem. I replaced 2 batteries before I decided to look further. When battery is new, and fully charged, it took about a week (not using the truck) for the battery to drain down. The alternator seems to charge the battery fine, and a test at my mechanic seems to verify.

When I hook up an ammeter in series with the battery and neg. cable, I had a .250 amp draw. When I pulled the fuse for the speedometer/GEM, the draw went down to .08 amps. I waited 40+ minuets for the GEM to go to Sleep, and it did not. Figuring I had licked the problem, I replaced the GEM with a used one from a salvage yard. Now the GEM goes to sleep, leaving me with .11 amp draw, which still seems too much (When I test my 2005 escape - "sleeping current" is .02 amps).

Here's the funny part. When I pull the big fuse under the hood marked "feul system / Anti Theft" the current goes down to .02 amps - right where it should be. The anti theft seems to be working fine, but .8 amps is obviously too much.

My questions are:

1. Where is the anti-theft module so that I may unplug to test?
2. What exactly is the "Fuel system"? - is that the fuel pump?
3. Any other ideas?

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post #2 of 2 (permalink) Old 08-11-09, 01:53 PM
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Re: 1996 ranger battery drain problem

I have a 99 ranger 4x4 with a very similar problem. The numbers are similar and the circut is slightly diffrent (wipers, interior lights, speedometer and GEM) but the numbers are too close to not be the same thing. As with resq12345's problem, pulling a fuse resolves imidiate Battery drain problem but not the real issue. Was there a fix for this. I'm trying to find GEM unit to replace but too many options to decied what to get. If I could find the unit in the truck it would be much easier to ordr correct unit. Late year build 99 has some 2000 equipment in it. First real problem in 205k miles. Looking forward to the next 205k miles. Can someone tell me where GEM is or what it look like?
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