1990 454 mag lost power
#32
Thread Starter
Registered

Joined: Jul 2018
Posts: 155
Likes: 9
#37
Thread Starter
Registered

Joined: Jul 2018
Posts: 155
Likes: 9
Ah, I just assumed the black wire was a ground and I didn’t test that either. I’ll see what I can see tomorrow, it’s pretty cramped in the dash underneath.
#38
Thread Starter
Registered

Joined: Jul 2018
Posts: 155
Likes: 9
#39
Thread Starter
Registered

Joined: Jul 2018
Posts: 155
Likes: 9
#40
Registered

Joined: Nov 2004
Posts: 14,100
Likes: 3,687
From: On A Dirt Floor
Just for quick test to make sure ignition switch is bad, hook purple to the battery terminal (b or batt) keeping the wire hooked to it, still hooked to it and start motor. If it runs, you have bad ignition switch, which it seems like due to your checking switch positions with multimeter.
Note: engine won’t shut off with purple wire hooked to battery power. You’ll have to unhook purple from it to kill the engine.
i have a 12-14 gauge wire with alligator clips to jump terminals for such things. Makes it fadter to diagnose, especially in cramped quarters.
Note: engine won’t shut off with purple wire hooked to battery power. You’ll have to unhook purple from it to kill the engine.
i have a 12-14 gauge wire with alligator clips to jump terminals for such things. Makes it fadter to diagnose, especially in cramped quarters.
Last edited by SB; 10-22-2022 at 04:23 PM.





