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I have a 90 XJ.the fuel pump is not getting power when key is turned on. I think the 15" kicker speaker in the back has caused this because it's never done this before until I put that beast in the back.. what do I do.

awg

check if there is a fuse

check for 12V and Earth at the fuel pump rear connector and/or relay

texastaz38

The speaker don't have squat to do with the fuel pump. That being said, where did you wire the head unit in for a power source? Constant hot or switched hot? With the switch on, does the stereo work or are they both dead? You haven't given us much to work with here as to what you have checked. More information is a must.

If all else fails, check the blinker fluid in the left rear tail light. I had that happen to me when i put my Marshal stack in the back of my 2 door xj. Appears that all the blinker fluid leaked out of the left rear and and shorted out the muffler bearings which resulted in all the gear mesh from the front differential to evaporate into the ECU private domain causing the dash lights to blink when air conditioner switch was turned on causing the air conditioner to blow out of the left and right vents in an SOS pattern causing a P0666 code. It was literally the Devil to figure out. LOL Just kidding man.

We do need more information though.

Happy Jeepin'
TexasTaz38

cruiser54

Take the speaker out? Look over the last work you performed?

OutbackOz

blinker fluid leaked out of the left rear and and shorted out the muffler bearings....................................... oh man that bad !

xjgerry

As a last ditch effort?

fb97xj1

I was thinking the same. Thats what i would do.

unidentifiedbomb

I'd check for ground. If you're really pushing a 15" sub that unibody is twerking more than a ghetto girl in the heart of Brooklyn and these old grounds are known to have issues over time.

Red1992XJ

Grounds could be the culprit. Check your work, check for power and ground, and then maybe even start cleaning all of the grounds just to be on the safe side.