3 replies to this topic

[bigbad79]

my bronco is eating through batteries. somehow its pulling power from the battery when the truck is off. i've checked the fuses by disconnecting the negative batt treminal and used a voltage reg but still nothing. how can find the problem without rewiring the truck? it also has a new voltage reg and new altenator

[4xfan78]

I had that problem on my 79 bronco, I found that the brake peddle switch was not adjusted and was causing the brake lights to stay on. Not sure if you have this problem but it's worth checking.

[Seabronc]

Can you see a discharge registering on the amp meter? Sounds like you have a short, probably a positive wire that has rubbed thru and touching someplace on the chassis. Removing the negitive terminal won't help if that's the case. If it's not a dead short or if the short is ahead of the fuse block no fuse will pop. Give a carefull look at the wire harness, roll it over especially any place it is directly touching metal.

Good Luck,

[Ziggy]

One way to look for the short is to turn the ignition off, take a test light and touch the probe end to each fuse, if you get juice on fuse that normally shouldn't have juice until key is turn on, that circuit has a short in it. Then go from there.