2006 chevy 2500 HD duramax won't crank intermittently. Heater fan won't blow at the same time.
While it is running the heater fan quits working and the brake light and abs
light comes on. If I shut it off like this it will not crank over. All the gauges and
dash lights power up like they are supposed to until I turn the key to crank and
they all lose power until I let the key go back to run position and they power
back up. This happens hot or cold. Been at the dealer for a month. Been going
on for 8 months intermittently. New batteries, cleaned ground to frame.
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