1986 gmc vandura 2500 firing order

1 ANSWERS

1. amomipais82
   

   Hi,
   You have a vehicle that likely has a corroded cable or a bad ground connection.  Something is causing a much higher than normal current requirement to start the engine.
   
   Possibilities include:
   
   1) Cables that have corrdoed or dirty ends.
   2) Cables that have corroded under their insulation near their ends (cannot be seen without removing insulation).
   3) A bad igntion switch.  The contacts can go bad and sometimes jumping the vehicle from another one will overcome the bad contacts.
   4) The "replaced" starter is defective.  This happens occasionally with rebuilt starters.
   5) A loose connection.  It is hard to install a starter on GM vehicles because the wiring attaches to the top of them.  Sometimes the connections will loosen as the starter is raised into position and bolted in.
   6) Has the battery been load tested?  A battery can seem fine, but have an internal problem which prevents it from delivering full current.
   7) The side terminal connections on GM vehicles are marginal, at best.  They will overheat and conduct less current than they should.
   8) A missing, loose, or corroded ground connection.  Check all grounds thoroughly.

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