2003 Hummer H2 Wont start or Crank

CHRISTIANM

MEMBER
2003 HUMMER H2

Engine Mechanical problem
2003 Hummer H2 V8 Four Wheel Drive Automatic exm miles

Hello everyone I have a 2003 H2 hummer it wont start, I did replace the starter still doesn't start and the battery cable is getting hot. When I try to start the car it makes a clack noise "clack clack" in the starter, but the engine wont turn. Can any one help me with this problem they is no dealer here in the Congo to help me with this car I'm on my own. The only work we ever done on this car was the fuel injections. After that everything start going wrong with the car.

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

No crank at all/nothing/nada:

Could be the starter relay, clutch switch/park and neutral switch and ignition switch assuming the battery and connections are good.

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Monday, March 22nd, 2010 AT 1:51 AM

HITHECK

MEMBER
1 POST

You hear a big CLICK then wire go hot on the battery.

You seem to have a mechanical jam on the engine.
I would suggest you remove the alternator strap and the AC strap.

Now then try to turn the AC compressor pully and the alternator pully.
If it does turn I would suggest you remove all spark plug then try to turn the engine.

You should fin what is stuck in there. I had same problem with a AC stuck.
But engin and alternator could do the same.

Hope this help.

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Monday, October 27th, 2014 AT 3:28 AM

JACOBANDNICKOLAS

MECHANIC
108,164 POSTS

Hi,

I attached the wiring schematic below, so you have a reference. (see pics 1 and 2) Note: There are 4 different fuses that will need to be checked and the starter relay. All are located in the under-hood fuse box.

First, check ign fuses A, B, E, and the crank fuse. See pic three below for locations. In addition to checking them, confirm there is power to and from them.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Note: Ign E fuse will only have power when the key is in the start or run positions. The crank fuse will only have power with the key in the start position. So, you will need a helper to test them.

If they all test good, we need to check the relay. If there is a different one in the fuse box having the same part number, switch them to see if it makes a difference. If there isn't one, here is a link that explains how to test the relay and circuit.

Do this and let me know what you find.

Take care,

Joe

See pics below.

Images (Click to make bigger)