jpk

I have a 96 Country 4x4, 4.0L.

Fuse #15 keeps blowing when I turn on my lights. The only things affected when it blows are the instrument lights and my fog lights. Head lights work as well as all gauges. I have an additional issue with my power door locks blowing a fuse when I unlock the doors. Locking works fine. I'm not too concerned with the door locks as I can live without the function but I do need the instrument lights working. Any suggestions as to how to track this down?

BlueRidgeMark

Start by disconnecting everything that is on that circuit. Then put a test light across where the fuse belongs, and start reconnecting things one at a time. When the test light comes on, you know you have the culprit.

Sometimes it's as simple as a bulb that has shorted. More often they blow, but once in a while they will develop an internal short.

jpk

I think I may have solved the source of the issue but I will check once I have the part out. I think the headlight switch itself has gone south. It seems the headlight switch in XJ's is prone to overheating and in some cases melting over time. I'm sure this is the original unit to the vehicle.

cpttuna

cut the hot wire to the fog lights. reconnect if they are not the problem.

jpk

They are factory fog lights. I have to remove the front bumper to get to the plugs to disconnect.

Jeepin'_Aint_EZ

I'd put my money on a crispy headlight switch

BlueRidgeMark

Yep, that's why the headlight harness is a good modification.

jpk

And so educate me. Headlight harness mod?

jpk

I have removed my HL switch. The harness plug is in like new condition. The headlight switch itself is also, externally, in like new visual condition. The switch operates smoothly, with firm positive clicks. I realize that means nothing but is it usual for the switch to look ok externally yet inside be toast? Still, since it such a PITA to remove I will be buying a replacement today. Any opinions on the BDW switch? Looking online it seems there are like two levels of quality. The BDW seems most like the original in construction. There are cheaper ones with a plastic looking rheostat platform. I will get the more expensive BDW but it's only around $25.00.

BlueRidgeMark

The headlight harness is a plug-n-play set of relays and wiring that plug in between your headlights and existing harness, also connect to your battery directly (or better yet, to the battery's connection to the PDC). It provides the high current needed to light your headlights, so that current does not run through your headlight switch. Your existing harness serves only to provide the needed switching inputs to the relays. It's an excellent mod for these old vehicles. The headlight circuit was a bit marginal originally, and with 2 decades or so on it, it hasn't gotten better. This takes the load off.

Lots of threads on it here.


For $25 bucks and the labor of replacing that switch, I think you are wise to go ahead and replace it, but it sure doesn't sound like it's the problem.

jpk

Once I get the switch installed and put the dash back together I will do the circuit test if the switch does not resolve the problem.

freegdr

Pretty basic install...


https://www.cherokeeforum.com/f51/pu...nstall-164659/

jpk

Could this be my problem? It is just under the left side of the driver's side carpet and backing. I've tried to look if it is supposed to go somewhere but I can't see any hint as to where it might go. It looks like it was sheared off, a clean cut.

Up is to the left.

Now that I'm looking at it a little closer, it doesn't look like a factory installed ground. I know the Jeep at one time had a CB radio installed on the tranny hump but it was on the passenger side.

Now sure it is an after market item.

jpk

So here is the situation now. Things that work; headlights, turn signals, brake lights, all gauges, all tell tele indicators, radio, blower motor.

Things that don't work; fog lamps, side marker lights front and rear, tail lights, gauge illumination, radio illumination, transmission gear selection illumination, transfer case lever illumination.

I am removing all seats and carpeting. I suspect the short is under the carpeting since I had removed it to wash it a few weeks ago. I may have over stressed one of the connections when I put the carpet in after the wash.

Jeepin'_Aint_EZ

Have you checked the factory fog light switch as well? Pretty sure those things were known to cause issues too.