HELP! Blowing ignition switch fuse
New User
Joined: Apr 2010
Posts: 5
Likes: 0
Well I have found my culprit, it was a short in the yellow and blue wire. I know this will make a bunch of you guys wrech but I simply bypassed the circuit and wired in a 12ga push button circuit isolated from the rest of the ignition. I know it's not cricket but it works
Thread Starter
|
Junior User
Joined: Mar 2002
Posts: 56
Likes: 0
From: Detroit area
Finally took my truck to a local electrical shop. Took them two and a half days of going through wiring schematics, and then the short was intermittent after moving wiring around, but the culprit was........a wiring issue leading to the number 5 coil on plug coil. He said the coil was good, but there was an issue leading up to it. I should have my truck back early next week! I'm glad it wasn't just me missing something obvious.
Fleet Owner
Joined: Mar 2012
Posts: 26,155
Likes: 4,149
From: Near Cal. Avenue
I take it you have no coded faults. So oooh!
disconnect and connect until the fuse blows. Start at the PCU. If it is a ign or fuel injector it will be out of the loop. Then disconnect all of them and connect until it blows. It is a quick process of elimination. If none of these are the problem look to the steering column. Open up and disconnect and connect again until the fuse blows. When you turn on the key the relay for the PCU closes, also the relay for the fuel pump closes and the PCU energizes the fuel injectors and the cop's. Unplugging relays turning on the key check if the fuse is good, plug in one relay at a time until the fuse blows. Total elimination of a path to ground, the gradually adding paths to ground until the fuse blows. If you find it to be a fuel circuit remove and add circuits until the fuse blows.
disconnect and connect until the fuse blows. Start at the PCU. If it is a ign or fuel injector it will be out of the loop. Then disconnect all of them and connect until it blows. It is a quick process of elimination. If none of these are the problem look to the steering column. Open up and disconnect and connect again until the fuse blows. When you turn on the key the relay for the PCU closes, also the relay for the fuel pump closes and the PCU energizes the fuel injectors and the cop's. Unplugging relays turning on the key check if the fuse is good, plug in one relay at a time until the fuse blows. Total elimination of a path to ground, the gradually adding paths to ground until the fuse blows. If you find it to be a fuel circuit remove and add circuits until the fuse blows.
Thread
Thread Starter
Forum
Replies
Last Post
tarheel007
1994.5 - 1997 7.3L Power Stroke Diesel
18
Mar 5, 2024 12:40 PM
860Xv10
Excursion - King of SUVs
24
Oct 21, 2016 11:12 AM
Haacker
1997 - 2006 Expedition & Navigator
4
Jun 15, 2016 08:39 PM
