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89 2.6 Troop starts and runs only while I hold the key to start position
Topic Started: Jun 11 2014, 06:54 PM (789 Views)
archmckinnon
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Ok.....
I know someone here has had this problem. My 89 Trooper will start and run only while I hold the ignition switch to the start position. When I release the key, the motor dies. when I start it and hold the key on and release the cluth pedal it also dies.
Ive looked at the thing and know its probably a very simple problem. I just need to step away from it and figure it out.


Any suggestions?


Arch
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johnny5ive
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Diode in alternator is bad.
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archmckinnon
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You are the man John! I knew you would know!
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Shiftlogic
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johnny5ive
Jun 11 2014, 10:00 PM
Diode in alternator is bad.
I know this an older thread but I had a similar issue yesterday and putting in an new alternator worked (The old alternator failed all tests) ;) I just wanted to add that I found another tip that can be used to diagnose. By running a jumper on the fuel relay you can activate the fuel pump from the battery manually. This allowed me to start the trooper without issue and keep her running; you have to be quick though as your fuel pump starts running as soon as the jumper is in place. This is not a fix but as the article stated it would allow you to get home if needed so thought I would share.

See attached image for placement of the jumper in the fuel relay.
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Attachments: Wiresize_sm.jpg (188.71 KB)
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