96 Blazer No Start, No Power to OBD Port or ECU
 

Hey Guys,

Im new to the forum but not to 4x4s . Hopefully you can help me out :)

Im trying to figure out if there is a main power relay to the ecu on a 96 Jimmy 4.3. Seems the one Im working on has no main engine power, when i turn the key to run I get no warning lights, which leads me to believe that the ecu isnt getting power. Am I on the right track? Obviously the truck wont start and it has no injector pulse, no spark, no nothing.

Wiring diagrams or a main relay location would be great. I tried checking fuses and swapping some of the relays around.

Thanks in advance!
Brandon

Hi.

Did you solve your problem?
I have the same on my 1997 Blazer.

I have the same problem. My 98 bravada does this randomly when i shut it off and go to start it again. No cluster lights or anything. Only the batt. Light shows. Then randomly all the warning lights come on and it starts right up.

Same problem here, no cluster lights = no start, but cranks, sometime the cluster lights works and then it starts, sometimes hitting the top of the dashboard makes the lights to come on and then it starts...
Anyone got a ide, going out now to rip it apart.
it's a Blazer 1997 125000 miles

Go to the google search box on the on BF home page and type ignition switch

Thanks it was indeed the ignition switch that was at fault, if i tap on it its starts working.

mine was ignition switch as well. it would crank til the battery was dead, but if i bashed the steering wheel, all the lights would come up, and it would start like normal.