1996 Jeep Cherokee electrical

Tiny
RIC JONES
  • MEMBER
  • 1996 JEEP CHEROKEE
  • 150,000 MILES
The blower fan, wipers & radio quit working. I replaced a 5 amp breaker in the fuse panel. All three items work with the ignition in accessory position, but will not work in on position or with engine running. Do I need to replace the ignition or is there some relay problem? If so where is the relay?
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Tuesday, July 9th, 2013 AT 5:06 PM

4 Replies

Tiny
CARADIODOC
  • EXPERT
This is typical of burned contacts in the ignition switch but you also have to check the connector for signs of melting and overheated terminals. A five amp fuse or circuit breaker is not for this entire circuit. The heater fan alone draws more than twice that much on the higher speeds. In fact, burned up ignition switches happen much more commonly when the heater is used on the highest speeds a lot.
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Tuesday, July 9th, 2013 AT 6:14 PM
Tiny
FREEMBA
  • EXPERT
Fuse # 7 (40A) is the blower motor fuse.
You can swap the blower motor relay (in the fuse box) with another identical relay to see if that gets it working [if so, replace the relay].
If they are good, with the key on and the blower motor switch on; check for power [12v] at the BRN/RED wire at the blower motor connector. Check the BLACK wire also; it is the ground wire.
If not power is there, yet the fuse and relay are good (on vehicles with automatic climate control), check for power on the RED wire at the blower motor module/resistor. It is located on the blower motor housing under the passenger side dash, behind the glove box area and is held in by three or four phillips screws.
If you have power there but none reaching the blower motor, remove the module/resistor for further testing using an ohmmeter. (Let me know if you need steps on how to do this.

The windshield wiper is circuit breaker 1 (20A). Swap that relay as well to see if that cures the problem. If so, replace the relay.

Check the radio fuse.
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Tuesday, July 9th, 2013 AT 7:22 PM
Tiny
MAXIMILIAM
  • ADMIN
Thank you for the advise. The ignition replacement did the trick.

Ric Jones
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Monday, July 15th, 2013 AT 5:20 AM
Tiny
CARADIODOC
  • EXPERT
Dandy. Did you inspect the terminals in the connector too? If two were dark or the plastic connector body was melted those terminals need to be cut out of the body and two new ones plugged in individually. About 4" of those wires will be hardened too from the heat. Those sections should be cut off and 4" of new wire spliced in. Solder won't adhere properly to hardened wire. (You can use two crimp-on terminals but solder them too for a better connection). If overheated terminals aren't replaced they will have some electrical resistance which causes heat build-up and soon you'll have the same problem.

If all of the terminals are shiny and tight, and all the wires have their normal flexibility, the switch contacts were probably just arced enough times to cause the problem without any heat migrating out to the connector. In that case you don't have to replace wires and terminals.
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Monday, July 15th, 2013 AT 7:33 AM

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