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Ok Mike, I know sometimes people add a ford type solenoid (actually just a relay) because the GM starters are troublesome. I did not know if the diesel trucks were different from gas trucks. It sounds like your relay under the dash is the only difference. I revised my post but you seem to...

This brings up a very good safety tip. The proper way to jump any starter soleniod is to jump the hot wire to the small wire that is the small current engagement wire that runs to the ignition switch. This is the only way to avoid the welding. If this does not work then the solenoid is not...

If this is the typical GM starter there is a solenoid that attaches at the top of the starter which acts like the ford soleniod on the fender and as the actuator that physically makes the bendix kick out and grab the ring gear. On 12 Gm vehicles there is no external solenoid. the start wire just...