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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29396
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Customer Question

I have a 2001 Chevy Blazer and it will not crank and i don't hear the fuel pump running when turn the ignition switch on. I have tested the starter by bypassing everything.
Submitted: 4 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 4 years ago.
Hello, I'm Cam. At anytime during our discussion you need more information or clarification, please reply.

When you turn the key on, do you see the check engine light in the dash?
Customer: replied 4 years ago.
Yes in run position all lights are lit when I turn to start all dash lights go out except I think the seat belt light.
Expert:  GM Tech (Cam) replied 4 years ago.
Pop the tilt lever out and take the lower trim of the column off. With your multimeter set to DC volts, place the red lead on the red wire. With the switch turned on, test the other leads with the black wire. Record the reading and let me know what those are. Repeat the test on the red/white wire. Let me know the results.
Customer: replied 4 years ago.
the Blazer is locked in a repair yard i can check that tomorrow on my lunch break.
Expert:  GM Tech (Cam) replied 4 years ago.
Check it out tomorrow and let me know what you find out then.
Customer: replied 4 years ago.
there are 3 red wires a large approx 10 ga red wire and 12/14 ga red wire and a 20 ga red wire and i do see one small red wire with white stripe.
Expert:  GM Tech (Cam) replied 4 years ago.
The 2 thick reds are the ones I am after.
Customer: replied 4 years ago.
numbers werenearly identical with either the red wire or the red/white wire. as follows brown=12v, red/white=1.62v, yellow=9v, green= 11.35,orange/black stripe=11.35v, white=0v, hvy orange=0v, hvy brown=0v,pink=.03v,red=0v
Expert:  GM Tech (Cam) replied 4 years ago.
If you hold the key in crank, does the yellow get 12v?
Customer: replied 4 years ago.
Expert:  GM Tech (Cam) replied 4 years ago.
Is there and change in neutral?
Customer: replied 4 years ago.
Expert:  GM Tech (Cam) replied 4 years ago.
Did you test power at the starter small stud then?
Customer: replied 4 years ago.
not yet, i bypassed thru the main fuse box, in the engine compartment
Expert:  GM Tech (Cam) replied 4 years ago.
Can you test the power to the ECM?