All I did was replace a tired eng and tranny now no go

[vman357]

ok, i replaced my eng and tranny(bought crate eng and tranny from dealer).when i crank it over the fuel pump won't come on,no headlights,no horn,no check eng light either.
everything else works.getting spark,turn signals,blower,wiper,ect.
have double grounded eng to body and frame,cleaned and reconnected ground wires.
have replaced following parts,
fuel pump relay
horn relay
headlight switch
fuel pump
fuel filter
new alt
any ideas? I think i may have a wire hooked up wrong,but i can't find a wiring diagram that tells where each wire goes....
PLEASE HELP i'm ready to pull my hair out !!! lol

Thank You for ANY help you can provide me !!!
Doug

P.S. it's a 90 4x4 full size blazer 5.7 tbi

[JWhite8055]

Fuses?

Check to make sure you didn't pinch any wires when setting the engine and tranny, or tuck the right wires out of the way somewhere and hook up the wrong set of connectors.

[vman357]

yup, fuzes all good, wires are clear,looks like the connectors only fit one way....
that's what has me soooooooo stumped..

Thanks for the reply,
Doug

[Gooseneck]

This may help you troubleshoot your problem. You say that you have alot of things not working. They are probably all related to one problem, maybe a wire out of place or disconnected. Just consentrate on the most simple circuit, say your headlights. If you track down why they're not working, you will most likely find all your trouble.

[Jeremy-WI]

Do your headlights work when you aren't cranking the engine? Have you checked the fuseable links to see if they're burned out?

[vman357]

The headlights don't work at all,and all my links test good...
replaced a questionable one going to starter..
something strange tho, the positive batt cable going to starter also has a smaller wire going from the batt to starter,, i don't understand why 2 wires to same place !!!!


Good one huh!!

Thanks,
Doug

[vman357]

Thanks Goose I'll try that, I just wish I had a GOOD wiring diagram..lol


Thanks,
Doug

[JWhite8055]

Haynes manuals have decent diagrams.

[vman357]

yeh i've got a Haynes and it isn't that good of a diagram, kinda vague.

Thanks anyways,
Doug

[chevytrucks92]

Might be something with the computer. I mean it sounds like you pretty much have went through all the possibilities, so maybe that is the problem.

[vman357]

OK I found my problem !!!
I ran a new wire from the batt. to the alt.
That cured my problem !!!
Truck runs like a raped ape now.....

Thanks for everyones help.
Hope this helps anyone else with this kind of problem....

Happy Truckin,
Doug