1991 Jeep Cherokee

Tiny
CANTU123456
  • MEMBER
  • 1991 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
I had hooked up a power wire to the accesory port on the fuse box insided the cab. The KC light it was hooked to drew to much power. It blew one of the big MAXI FUSES in the f. Box under the hood. I replaced it and dont have any power going back to the fuel pump. The relays dont even click when I turn the key. There is no power going to the resistor mounted on the fender well. Everything else works fine lights, blower motor, exct. Why is there no power going to or from the resistor. What else can I check to find out. The fuel pump is not coming on
Friday, April 3rd, 2009 AT 2:23 PM

3 Replies

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
OK I would check the auto shut down relay it is what powers the fuel pump relay and hey always relay lights and make sure what power circuit you are going to power them from ok. The auto shut down relay is located on the right (passanger) front fender by the power distribution box or underneath it. There is also a ballist resistor relay there too that also powers the fuel pump relay so I would check them both. Let me know what you find.
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Saturday, April 4th, 2009 AT 9:08 AM
Tiny
CANTU123456
  • MEMBER
  • 7 POSTS
I said hell with it and replaced all the relays under hood. Before I had no power to the resistor. Now I have 1 and a half votes. Not nearly enough to kick on the fuel pump. It also brought my spark back cause I had no spark.
Either when I crank it over or just have the key on the voltage stays the same at the resistor and back at the fuel pump when I crank it It registers bout the same volts as the resistor did. So at least we"re moving forward I dont know what else it could be. All fuses under the hood are good as well as the box inside the vehicle.
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Saturday, April 4th, 2009 AT 5:54 PM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok here is what you need to do now from the fuel pump relay there is 2 dark green wires with a stripe and one goes to the ballast resistor relay and one goes through a ballast resistor and after the resistor turns into a dark green wire with a tan strip, this is the wire you need to check with your multi meter ok. You need to check voltage on the dark green and black side and then on the dark green and tan side and see that the voltage is close to the same if not then that resistor may have blown. Let me know what you find and we will go from there.
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Monday, April 6th, 2009 AT 9:32 PM

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