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Unread 09-16-2010, 04:15 PM   #1
chachi77
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1993 FSJ Cherokee 
 
Join Date: Sep 2010
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Electrical Issue

Hi guys,
I have a 93 Grand Cherokee 5.2 L . It blew the 2 X 60 Amp Alternator fuses under the hood as it left me standed. I have since replaced the fuses and have no power going to the coil. It turns over but no fire. Ive been tracing wires to find a short but am dumbfounded. Any one had this issue before and can steer me in the right direction

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Unread 09-16-2010, 04:37 PM   #2
iPlay1515
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Quote:
Originally Posted by chachi77 View Post
Hi guys,
I have a 93 Grand Cherokee 5.2 L . It blew the 2 X 60 Amp Alternator fuses under the hood as it left me standed. I have since replaced the fuses and have no power going to the coil. It turns over but no fire. Ive been tracing wires to find a short but am dumbfounded. Any one had this issue before and can steer me in the right direction
Check fuses F2 20 amp and F15 30 amp.
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Unread 09-16-2010, 04:43 PM   #3
chachi77
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Power coming to all fuses and fuses test ok.
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Unread 09-16-2010, 04:53 PM   #4
iPlay1515
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Quote:
Originally Posted by chachi77 View Post
Power coming to all fuses and fuses test ok.
F2 supplies power to the automatic shutdown relay which in turn applies power to the coil.


The PCM provides ground to the coil similar to old style mechanical points.

Check the bottom side of the auto shutdown relay for numbers and post on forum thread.
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Unread 09-16-2010, 04:57 PM   #5
chachi77
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The auto shut down relay tests for power....even switched out the relay ....still not getting power to coil
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Unread 09-16-2010, 05:05 PM   #6
iPlay1515
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Quote:
Originally Posted by chachi77 View Post
The auto shut down relay tests for power....even switched out the relay ....still not getting power to coil
The FSM shows an 18awg Dark Green / Black wire from the ASD Relay to a two wire connector at the coil.
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Unread 09-16-2010, 05:06 PM   #7
chachi77
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the shutdown relay # 56006707 83159 2402 is also the same relay # for the AC relay and fog lamp relay.....and all have power coming to them and I tried switching them all around as well
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Unread 09-18-2010, 05:49 AM   #8
mca1977jpsnet
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So you have no spark?? Do you have no fuel either? Check crank sensor and cam sensor/magn pickup (in dist) for power in/output.
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Unread 09-18-2010, 08:31 AM   #9
iPlay1515
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Quote:
Originally Posted by mca1977jpsnet View Post
So you have no spark?? Do you have no fuel either? Check crank sensor and cam sensor/magn pickup (in dist) for power in/output.
If the coil does not have 12 volt power when the ignition is on, nothing else matters right now.
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Unread 09-19-2010, 03:10 PM   #10
chachi77
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Figured it out guys...My buddy came over with a scanner and pulled code #11 crank signal ....its the crank position sensor....why it blew the fuses he has no idea....Ill try to swap it out by next weekend. Wish me luck!! ha ha
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Unread 09-22-2010, 07:09 AM   #11
mca1977jpsnet
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When you replace crank sensor check fuse, connector, and wiring for damage or corrosion.
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Unread 09-23-2010, 12:03 PM   #12
chachi77
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The crank sensor had actually broke off form its housing causing it to drop a bit blowing 2X60 AMP fuses for the alternator. Replaced the fuses and crank sensor, fired up perfectly. All is well in Jeep town. Now shes up for sale!!!
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