Do the headlamps come on , are they bright ? If so, not a battery issue . Turning the key on , just on ,not trying to start the truck , do the light's on the instrument cluster come on ?
Testimonial: "Head light comes on and the instrument cluster on"
Manual or automatic transmission ? Do you know about relays ? Park neutral safety switch etc...
Do you know how to use a DVOM - digital volt meter ?https://www.youtube.com/watch?v=XhRPLgH6...
Problem on load side or control side of the circuit . Load side - main B+ cable to the starter , control side run crank relay , ignition switch etc... Do you know how to read an under stand a wiring diagram ? Free one's here http://www.bbbind.com/free-tsb/ Enter vehicle info. year , make , model . Under system click on engine , then under subsystem click on starting . Click the search button , then the blue link .
Circuit Description
Moving the ignition switch to the START position signals the body control module (BCM) that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the powertrain control module (PCM) requesting engine start. The BCM also energizes the RUN/CRANK RELAY. When the RUN/CRANK RELAY switch side closes, and the vehicle is in Park/Neutral or with the clutch fully depressed, if equipped, supply voltage is applied to the PCM CNTRL relay coil. The PCM verifies the transmission is in Park/Neutral or if the clutch is fully depressed, if equipped. The PCM will then ground the control circuit of the PCM CNTRL relay, closing the switch suppling voltage to the starter solenoid. On some vehicles the starter will continue to crank the engine with the key released until it starts, the crank command has timed out to prevent excessive heat build up in the starter circuitry or the PCM receives an engine run flag.
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SOURCE: I have a 2007 H3 hummer, suddenly my fan does
It's the HVAC blower resistor in the air plenum under the glovebox. New resistor and wiring harness is about $70 at the Hummer Dealer.
SOURCE: the blower motor stops working sometimes
I had the same problem and sloved it with the help of google images, hummer blower motor resistor. Under the glove box the blower motor resistor can be found. It comes loose and the blower will work at times. When I reached under and pushed the connector in, it works fine. It was fixed within minutes. I am a gal with a Hummer and save myself a huge dealer bill. Good Luck!
SOURCE: check engine light came on after oil change
SOUNDS MORE LIKE SOMEONE KNOCKED OFF A WIRE CONNECTOR DOWN BY THE OIL FILTER AREA, RATHER THEN A RESET OF THE CHECK ENGINE LIGHT...SCAN OR HAVE THE SYSTEM SCANNED TO SEE WHAT CODE IS SET IN THE COMPUTER THIS MAY HELP YOU TO FIND THE CULPRIT IN 1/2 THE TIME, AFTER ITS DONE USE THE SCAN TOOL TO CLEAR THE CHECK ENGINE LIGHT, MAKE A NOTE OF WHAT CODE IT WAS AND DRIVE FOR A FEW DAYS TO BE SURE IT DOESN'T COME BACK AGAIN.
HAPPY MOTORING!!
SOURCE: how to change the fuel filter in 2007 hummer h3
This year and model does not have an inline fuel filter.
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