1999 GMC Yukon not crancking

Tiny
MELVINO
  • MEMBER
  • 1999 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
Engine do not turn, batt ok, ignition switch wire replace, ingition relay replace. The fuel pump getting juice
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Saturday, August 21st, 2010 AT 1:07 PM

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Tiny
JDL
  • EXPERT
I'd have to be sure the battery has a full charge and the battery connections are good. Next, I'd check the circuits at the starter relay. Terminal 30 is hot all the time? Terminal 86 goes hot with the key in the crank position. There are fuses involved, not only check the fuses, use a voltage tester on the fuse circuit. Even if the fuse is good, if no voltage, the circuit is dead.

Did you try cranking in neutral? There is also a crank fuse, not shown in the picture, that has to do with terminal 86.


http://www.2carpros.com/forum/automotive_pictures/170934_yukon_starter_circuit_1.jpg

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Saturday, August 21st, 2010 AT 1:47 PM

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