1991 gmc van won't crank over.

1991 GMC C3500
141,000 MILES
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JTDBA
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For months, the truck would occasionally failed to turn over on the first try, usually when hot. Then it failed all together. So far I've replaced the starter, battery, ignition sw, and neutral safety sw. The key still won't provide power to the starter solenoid. There doesn't seem to be an ignition fuse.
Could a defective ECM be at fault or should I be looking for a short?
Aug 31, 2011 at 3:52 PM
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RASMATAZ
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Check if its a security issue if not recheck the ignition switch-try this cross the starter motor solenoid terminals and see if it cranks over the egnine-
Aug 31, 2011 at 3:58 PM
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JDL
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The purple wire at the starter solenoid should be hot with the key in the crank position. Note picture below.

You may have to check feed to and from the ignition switch.
Image (Click to enlarge)
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Aug 31, 2011 at 4:04 PM
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