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AMEDEE
AMEDEE, CHEVY TECHNICIAN
Category: Chevy
Satisfied Customers: 24447
Experience:  ASE certified tech ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
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No crank, 2002 trailblazer, I changed starter - same issue.

Customer Question

No crank
JA: What is the model/year of your Chevy?
Customer: 2002 trailblazer
JA: Are you fixing your Trailblazer yourself? What have you tried so far?
Customer: I changed starter - same issue. I can jump from bat to starter and it will turn ober
JA: When you turn the key, do you get a single loud click, or a series of rapid ones?
Customer: single loud click - feels like Bendix is engaging
JA: Anything else you want the mechanic to know before I connect you?
Customer: hmm no
Submitted: 1 month ago.
Category: Chevy
Expert:  AMEDEE replied 1 month ago.

Hello and welcome!

My name isCustomerand I can assist you with your question.

Expert:  AMEDEE replied 1 month ago.

How much voltage do you get down at the starter with the key in the CRANK position?

Customer: replied 1 month ago.
Not sure I can check it will take a few minutes
Expert:  AMEDEE replied 1 month ago.

Ok, no problem. Take your time..

Customer: replied 1 month ago.
I get 12.4 at both the battery and starter
Expert:  AMEDEE replied 1 month ago.

On both the BIG and SMALL wire going to the starter?

Customer: replied 1 month ago.
I get 12.4 on the big stud on cellanoid and 000 on small stud
Expert:  AMEDEE replied 1 month ago.

The small wire going to the starter should get battery voltage on it with the key in the CRANK position. If not, this is the problem.

Customer: replied 1 month ago.
OK. It is getting no power
Expert:  AMEDEE replied 1 month ago.

Are you sure?

If so, then I would check to ensure that the engine is not locked up.

Customer: replied 1 month ago.
Engine turns over by hand and when I jump power from battery to starter
Expert:  AMEDEE replied 1 month ago.

Oh, so the small wire does not have power..

Customer: replied 1 month ago.
Correct
Expert:  AMEDEE replied 1 month ago.

Are there any anti theft or security lights on or flashing on the cluster?

Customer: replied 1 month ago.
No
Expert:  AMEDEE replied 1 month ago.

Ok, are there any codes in the computer?

Customer: replied 1 month ago.
No and no pending codes
Expert:  AMEDEE replied 1 month ago.

Ok, you will need to check the starter relay and circuit to find out why there is no power down at the starter.

The starter relay gets two powers and one ground with the key in the CRANK position.

Here is a wiring diagram.

Customer: replied 1 month ago.
I have verified with a test light hooked to negative power to the 2 right hand sockets on relay and with light to positive on the top left socket when key is turned to crank.
Expert:  AMEDEE replied 1 month ago.

I am sorry sir, but I dont understand your reply.

What is the relay missing? Power or ground?

Customer: replied 1 month ago.
Basically all checks out ok
Expert:  AMEDEE replied 1 month ago.

So does the relay click or not when you turn the key to the CRANK position?

Customer: replied 1 month ago.
I do not hear the relay click but I do hear a click at the starter like the Bendix is hitting
Expert:  AMEDEE replied 1 month ago.

Well, if the small wire at the starter is not getting battery voltage, then the starter cannot activate.

Customer: replied 1 month ago.
Correct. Where do I go from here?
Expert:  AMEDEE replied 1 month ago.

Verify that you do or do not have power going to the starter on the small wire.

Customer: replied 1 month ago.
still no power
Expert:  AMEDEE replied 1 month ago.

Ok, then you check for power leaving the starter relay with the key in the CRANK position.

Customer: replied 1 month ago.
OK - on the diagram you sent me I have located the stater relay 47. there are 4 input locations - sockets - what ever you want to call them. I am going to label then 1 to 4 . 1 is top left - 2 top right - 3 bottom left - 4 bottom right. 1 and 2 I have verified that they have power getting to them by connecting a test light to the negative lead on the battery and testing each socket. 3 I have verified that it has power by connecting a test light to the positive lead on battery and turning key to crank. I should be able to jump between 1 and 4 to get the starter to crank - but when I do I get the same click/clunk from starter/Bendix
Customer: replied 1 month ago.
https://www.youtube.com/watch?v=iMzdYCA0s2w
Expert:  AMEDEE replied 1 month ago.

Because the wiring diagram I sent does not have the pins numbered, I dont know which ones are which. The only way to know this is to look at the wiring going to the back of the relay and matching them up to what you have on your vehicle.

The engine should crank if you jumper power to the purple wire leaving the relay.

Customer: replied 1 month ago.
Purple should be #4. I get the same clicking as when I try to crank from key - but when I jump straight from battery positive to 2nd large stud and starter selanoind the motor cranks over.
Expert:  AMEDEE replied 1 month ago.

So your not getting power to the BIG terminal at the starter?

Expert:  AMEDEE replied 1 month ago.

Or your saying the solenoid?

Expert:  AMEDEE replied 1 month ago.

It sounds like you might have an open or a break in that purple wire from the relay to the starter.

Customer: replied 1 month ago.
Solenoid built onto the starter. It has 3 studs. One big one with power. one small one with no power, and a second large one going straight to starter
Expert:  AMEDEE replied 1 month ago.

Ok, yes, so the small purple wire is not getting power..

Customer: replied 1 month ago.
Expert:  AMEDEE replied 1 month ago.

So if you supply power directly to pin 4 of the relay (purple wire), then the engine should crank.

If not, then you have an open or a break in the wiring from the relay to the starter.

Customer: replied 1 month ago.
when I do this jumper I get the same click/clunk/thunk at the starter like the bendix is engaging but it does not turn over
Expert:  AMEDEE replied 1 month ago.

Right, thats because the starter is not getting power.

Expert:  AMEDEE replied 1 month ago.

So you need to either fix the purple wire going to the starter or simply run a new wire from the relay to the starter and you will be good to go!!

Expert:  AMEDEE replied 1 month ago.

I am glad I can help!

It has been a pleasure working with you. Please dont forget to honor your good faith deposit by rating my answer as "5 STAR SERVICE" for assisting you today.

Keep in mind, we can still continue this conversation at no further cost to you even after you rate my answer. Just reply back to me using this page and I will get it and get back to you ASAP!

Please let me know if you have any further questions.

Expert:  AMEDEE replied 1 month ago.

Did you have any further questions?

Expert:  AMEDEE replied 1 month ago.

Hello! It'sCustomerfrom just answer.

I am just checking in to see if you need any further assistance?

Let me know!

Expert:  AMEDEE replied 1 month ago.

Good afternoon.

I see you have viewed my last reply but have not responded back. I am just checking in to see if you have any further questions or to see if you still need help with anything? If so, please let me know as I will be happy to help. If I have answered all of your questions, please dont forget to honor the good faith rating system to complete this conversation.

Thank you and have a great weekend!

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