I have just rebulit the engine on a '98 Blazer V6, 4.3L. My check engine light has come on so I connected my ODM II tester on it and it will not come on at all. I was wondering if the computer had to be reset or if there is something I could have missed. All 4 color coded wires are hooked up in the right locations. I have tapped on the box under the hood and that has not worked either. I am at a loss. Please help. Thanks

I have just rebulit the engine on a '98 Blazer V6, 4.3L. My check engine light has come on so I connected my ODM II tester on it and it will not come on at all. I was wondering if the computer had to be reset or if there is something I could have missed. All 4 color coded wires are hooked up in the right locations. I have tapped on the box under the hood and that has not worked either. I am at a loss. Please help. Thanks

OBD11 plugin should have more than 4 wires.
http://www.troublecodes.net/OBD2/

Check pin 16 for 12 volt battery power.
If no power start checking fuzes for 12 volt power both sides.
Does cigar lighter work?

Thanks a million for the info. Just to let you know, the fuse for the cigarette lighter was blown. It is now working. Thanks!!!

Thanks a million for the info. Just to let you know, the fuse for the cigarette lighter was blown. It is now working. Thanks!!!

You are welcome and thanks for posting back how it went.
Glad you found problem.