Notices
1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Finding a short or bad ECM?

Thread Tools
 
Search this Thread
 
Old May 29, 2021 | 01:21 PM
  #1  
Duckf00t's Avatar
Duckf00t
Thread Starter
|
New User
Joined: Jan 2020
Posts: 7
Likes: 0
Finding a short or bad ECM?

Thanks for reading this- the battle rages on. 1993 f-150 5.0
So changed fuel pumps(dual tanks), ignition control module, map sensor and starter in last month. What it has been doing is starts cold just fine, warm forget it. So changed ICM, didn't help. In fact it's worse, started it yesterday after got warm shut it down. Nothing at all. I found it's got a short, turn ignition switch on battery drops to like 3 volts immediately. So went about disconnecting things until found it. The main power wire goes around the front to the fuse box under the hood. Touch it at fender solenoid voltage drops. So jumped that wire to eliminate a bad wire. It's somewhere from fuse box to cab power supply. Here's the questions. Can a bad ignition control module do that? Can a bad computer do that? Any other likely suspect? Searched high and low for rub wires, none. Checked headlight wires good,

The positive terminal gets hot really fast if the wire is connected. After charging battery holds charge just fine over night. This truck got me ready toss match in front seat walk away. Hope someone has a clue for me.
going to try and include a picture of the wire that's got short.

 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
81f1504x4
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
3
Feb 7, 2015 05:18 PM
Alfonzy
Electrical Systems/Wiring
9
Jan 11, 2012 05:01 PM
Zendrum
Electrical Systems/Wiring
1
May 1, 2011 04:29 PM
blakeusa
Electrical Systems/Wiring
1
May 4, 2008 09:14 AM
79F150EFI
1987 - 1996 F150 & Larger F-Series Trucks
1
Mar 11, 2007 07:22 PM




All times are GMT -5. The time now is 11:13 AM.

story-0
Top 10 Fords at 2026 Carlisle Ford Nationals

Slideshow: Top 10 Fords at 2026 Ford Nationals

By Joe Kucinski | 2026-06-09 11:10:08


VIEW MORE
story-1
3 Best / 3 Worst Parts of Modern Ford Ownership

Based on years of owning multiple modern Ford products.

By Brett Foote | 2026-06-09 10:53:36


VIEW MORE
story-2
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

SPONSORED: From muddy boots to rain-soaked cargo, these upgrades address some of the most common frustrations Ford truck owners face every day.

By Pouria Savadkouei | 2026-06-08 18:50:34


VIEW MORE
story-3
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-4
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-5
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-6
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-7
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-8
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE
story-9
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE