Question about Jeep Grand Cherokee

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1999 jeep fuse 8 drains battery

Whenever I leave fuse8 in the panel it drains the battery. If i pull the fuse the battery stays charged but the heater/AC no longer work. What else is powered by fuse8? I'd like to disable whatever is draining it so i can still have heat/cool. Thanks

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  • mauzer82
    mauzer82 Feb 18, 2012

    thanks for the answer. I'm working on a 1999 Grand Cherokee

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  • Jeep Master
  • 17,970 Answers

What Jeep year and model there?
Sound like a problem with the ground connectiosn, bad harnesses at some devices or sockets or damaged wires. You will need to know what circuit contoled this fuse to start to searhc.

Hope this helps; keep us updated.

Posted on Feb 14, 2012

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SOURCE: 1999 Mercury Mountaineer, heater/AC fan no longer blowing

I would check the fan first disconnect the electrical connectors on it and use a pair of home made jumper cables and run it from the battery. If it works move unto relay if it doesn't you've found the culprit.
Next check relay in the fuse box. Coolant tempertant switch(CTS) aka thermal switch and its circuit. CTS is usually located in the water jacket by the t-stat.

Posted on Apr 05, 2010

  • 308 Answers

SOURCE: 1999 jeep cherokee sport heater/Ac

That is a bad fan switch.

Posted on Jun 15, 2011

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1 Answer

Battery drain, fuse #12 in 2000 Jeep Grand Cherokee


On the 2000 Jeep Grand Cherokee the # 15 fuse is the IOD circuit. (Ignition Off Drain) The # 12 fuse is the power windows. Both fuses are 50 amp.

This IOD fuse #15 powers the distribution box that contains the 50 amp fuse. Pull each fuse in the under hood.

Pull each fuse in the under dash. Check for on the passenger side floor is an additional fuse panel.

Before going to far suggest at night checking for any lights lit. The draw is about right for a small light bulb.

Typical draw for parked car is around 100 milliamps

Suggest that you disconnect power to the car for several minutes. Reconnect the battery. The object is to reset the body electronics module.

If the computers in the modules get a glitch they can cause a drain. By cycling the power, disconnecting battery, they will reset to factory settings. Reported it can take up to 20 minutes for the circuits to drain before you can reset!.


26255032-5gjksekvxmweb1huyds5yay0-2-2.jpg The Jeeps have several modules that can cause a drain
Jeep Grand Cherokee WJ Electronic Control Modules

the following web site does a great job of explaining all that is going on. What appears to be simple to troubleshoot is not so easy. He comments about delay before sleep are important. Testing after overnight may result in a different drain rate. Make sure that your battery meets specifications. In 2000 the drain rate may be relatively high and the reserve capacity of your battery low.
http://www.tomorrowstechnician.com/parasitic-drain-ii-jeep-grand-cherokee
Hope this helps?

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Modules or Relays are not going to sleep
or timing out & running the battery down

Have to leave the doors closed up to 1/2 hour with a
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You Tube has video on (Parasitic Current Drain Test)

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I would say that both issues are related. Which isn't good news, but at least when you find your pwer drain, it will make perfect sense. If have tried many time to piece meal troubleshooting a problem like this and just wasted time, by not doing it right.

You will need an accurant clamp on amp meter, to do it though. You clamp it around the main battery cable (red side) - pull all the fuses out f your fuse box and then one at a time put them in an write down what the reading is. Once you find the drain (high amperage pull although it is off) then you can look at the fuse panel diagram and figure out what it controls.

Make sure you know the fuse panel layout and sizes before you start.

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