Wires found under dash looking for no spark issue

[D-1-0-N-]

So I bought this truck running and driving drove it for about a week and now no spark, I've replaced the distributor which came with a module the coil and wires. Coil refuses to spark checked the voltage on pink wire which was fine also for some reason when I plug my dash in the alternator smokes? I've replaced all main engine grounds so I'm at a loss, 1991 Chevy 5.7 

Edited August 13, 2024 by D-1-0-N-
Make model year

[richard wysong]

TBI or Vortec? sounds like you got a wire crossed somewhere if the alternator is smoking

[D-1-0-N-]

Tbi would make sense why its smoking when the cluster is plugged in. Does the crimping/soldering come factory like this or is this some lovely wiring job someone did? They were wrapped in heat shrink.

Edited August 14, 2024 by D-1-0-N-

[richard wysong]

thats factory

[D-1-0-N-]

Do you know if there's a ground inside the cab maybe? When I got the truck they had a box under the dash and I pulled it out and It had a ground wire from it

[richard wysong]

what kind of box?

[D-1-0-N-]

This box apparently its for a trailer? Idk what it would be on a 1/2 ton.

[richard wysong]

Trailer brakes. Google the wiring diagram for the ignition system. I believe the ECM controls the coil from what I could see on my tiny notebook

[D-1-0-N-]

I've replaced everything I could think of but my coil isn't getting spark i got power on the pink wire no power on the white to the tac truck turns over but thats about it, my injectors pulse my fuel pump powers on. I'm stumped on the alternator and dash problem as I can't find anything on the drivers side out of place.

[D-1-0-N-]

9 minutes ago, richard wysong said:

Trailer brakes. Google the wiring diagram for the ignition system. I believe the ECM controls the coil from what I could see on my tiny notebook

It could definitely be my ecm but what gets me is it gets fuel but it does have a cel on for code 12 which just keeps flashing after the third orientation 12s so the system is working but it shouldn't be on and I read the ecm can throw random codes. It also did have a rough idle aswell I appreciate you Richard ill have to get another ECM and test it out.

[richard wysong]

the good thing is that it's plug and play, no programming. Is there a crankshaft sensor? I can't remember, getn old I guess. If there is check the wiring to it for a short