I screwed up big time……………

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   1991 F-350 
Was messing around in the shop today, thought I would look at the Craftsman battery charger my Son has, that will not work right on his BMW. So I figured I would hook it to the batteries on the 350 and investigate. Turn on the headlights, to give the charger something to do, after maybe 3 or 4 minutes I noticed the clearance lights on the truck went dark. Headlights stayed on. 
Opened the fuse box, fuse In position #4 blown, replaced fuse(15 amp) pulled light switch out, pop goes the fuse. All other lights work, brake, signal, hazard. 
Clearance lights, and dash lights(they are tied together) will blow the fuse. 
Any idea on where to start before prodding around on 30yr old wire harness?

	This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
	The Forum	Parts and Services	Unofficial Allis Store	Tractor Shows	Serial Numbers	History

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
Lars(wi) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 14 Sep 2009 Location: Permian Basin Points: 8230	Post Options Post Reply Quote Lars(wi) Report Post Thanks(0) Quote Reply Topic: I screwed up big time…………… Posted: 2 hours 59 minutes ago at 9:38pm
	1991 F-350 Was messing around in the shop today, thought I would look at the Craftsman battery charger my Son has, that will not work right on his BMW. So I figured I would hook it to the batteries on the 350 and investigate. Turn on the headlights, to give the charger something to do, after maybe 3 or 4 minutes I noticed the clearance lights on the truck went dark. Headlights stayed on. Opened the fuse box, fuse In position #4 blown, replaced fuse(15 amp) pulled light switch out, pop goes the fuse. All other lights work, brake, signal, hazard. Clearance lights, and dash lights(they are tied together) will blow the fuse. Any idea on where to start before prodding around on 30yr old wire harness?
	I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.

Sponsored Links

TedN Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 30 Apr 2025 Location: Central WA Points: 113	Post Options Post Reply Quote TedN Report Post Thanks(0) Quote Reply Posted: 40 minutes ago at 11:57pm
	I think I would get an auto reset circuit breaker to put in place of the fuse (only for testing, you will want to go back to a fuse once it is fixed) and turn the lights on. Then observe to see if there are any lights that don't come on for the brief moment the circuit breaker comes back on. If it is in the dash lights turning them all the way down should cause the breaker to stay on a little longer. The other potential trouble spot can be a trailer plug if it has one, last thing you think of because it doesn't light up. Hope this helps get you looking in the right direction. Edit: I should also point out that using an auto reset circuit breaker will heat the wires going to where the short circuit is, and leaving it on too long may lead to a fire. Ted Edited by TedN - 30 minutes ago at 12:07am
	190XTD seriesIII, 190XTD seriesI, maroon belly 7000, 190XTD series??? project(or maybe parts)