hdtv27ew
New member
- Joined
- Oct 9, 2007
- Messages
- 2
- Reaction score
- 0
- Points
- 0
- Location
- Virginia
- Vehicle Year
- 1987
- Vehicle
- Bronco II
The last year or so I have had problems with the electrical system in my BII, no big surprise, but frustrating. On cold starts the truck would stumble and hesitate and you could make it go if you floored it and stayed on it, but ran rough, especially we you got over 35-40 mph. After much checking of the basics many times, I found all the problems were ground related. The main battery cable runs down towards the block, but stops at the frame where it was clamped to the frame and then continued on to the bolt on the side of the block. Where the bare ground wire was clamped to the frame, the wire was corroded and about half it's normal size. I replaced the clamp on the frame with a bolt and ran two new ground wires, one directly from the battery to the block and then one from the block to the new bolt on the frame. Two of the problems I was having went away.
The next bad ground was the ground from the computer to the body behind the kick panel on the passenger side. The ground appeared to be good with no corrosion, but with the age of the truck the ground path back to the battery had deteriorated. I ran a temporary jumper from the ground bolt by the computer to the battery and took the truck for a drive and miraculously the rest of the driving problems vanished......except for one. I ran a new 16ga wire back to ground point on the front frame by the battery and started working on the last problem.
If you turned on the fan control to medium or high you could see the lights dim and the truck would stumble under load. I took the dash apart and found there is a large ground wire that leaves the fan controller and disappears towards the fuse block, but could not find where it landed but I'm betting it terminated on the firewall sheet metal. I cut the black wire on the fan control and replaced it with a #10ga wire from the controller to the front frame ground point and replaced the spade connectors with a ground lug and re-terminated all the grounds. This solved the fan problem.
Every ground wire I inspected has had some type of corrosion problem, so I am in the process of replacing all of them, one at a time. The Bronco II hasn't run this good since it was new! If you are having any computer related problems that you can't explain......get grounded and see if it solves the problem!
http://www.therangerstation.com/forums/images/smilies/biggrin.gif
Good luck!
The next bad ground was the ground from the computer to the body behind the kick panel on the passenger side. The ground appeared to be good with no corrosion, but with the age of the truck the ground path back to the battery had deteriorated. I ran a temporary jumper from the ground bolt by the computer to the battery and took the truck for a drive and miraculously the rest of the driving problems vanished......except for one. I ran a new 16ga wire back to ground point on the front frame by the battery and started working on the last problem.
If you turned on the fan control to medium or high you could see the lights dim and the truck would stumble under load. I took the dash apart and found there is a large ground wire that leaves the fan controller and disappears towards the fuse block, but could not find where it landed but I'm betting it terminated on the firewall sheet metal. I cut the black wire on the fan control and replaced it with a #10ga wire from the controller to the front frame ground point and replaced the spade connectors with a ground lug and re-terminated all the grounds. This solved the fan problem.
Every ground wire I inspected has had some type of corrosion problem, so I am in the process of replacing all of them, one at a time. The Bronco II hasn't run this good since it was new! If you are having any computer related problems that you can't explain......get grounded and see if it solves the problem!
http://www.therangerstation.com/forums/images/smilies/biggrin.gif
Good luck!
there is a ground by the mcu?dang it!