2004 GMC Yukon Power cuts off when trying to start

SCRAPPY14

MEMBER
2004 GMC YUKON
V8
2WD
AUTOMATIC
75,000 MILES

I just replaced the battery in our 04 Yukon. After attacehing battery cables to the new battery, I turned the key to the first position to confirm that I indeed had power (Stereo, door locks, lights etc working fine). As soon as I turned the key all the way to ignition all power was immediately lost throughout the vehicle. It never made a crank sound, it just cut power instantly similiar to a circuit breaker tripping. The new battery test out fine. I removed the battery cables and re-attached and power was restored until I tried to start the engine again at which time a repeat of the power loss occured. Could this be caused by a short circuit in the starter casuing a circuit breaker to shut down power? One Note: The battery cables screw into the side of the battery. The negative cable is snug and doesn't move but the positive moves around some, even though the screw is tight and there apperas to be good contact to the battery.
Any help would be greatly appreciated.

7 Replies

JDL

MECHANIC
16,098 POSTS

Did you try cranking in neutral? Also, check the circuits at the starter relay in the power distribution center. When you turn the key to crank, any reaction with the dash lites or dome lite?

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Thursday, September 3rd, 2009 AT 11:08 AM

SCRAPPY14

MEMBER
4 POSTS

I didnt try cranking in nuetral. And I just went out to try and after re-connecting the battery I get no power at all. At least with the first few tries I would get power unitl I turned the key to crank. To answer you question I got no reaction with the dome or dash lights before when I tried to turn the key to rank. As soon as I would turn the key all power was immedialtey lost.