Hi!

I have a 1986 fullsize bronco that has had a 6 to 302efi swap...!The problem i have is sometimes it looses all electrical nothing NADA!I can wiggle the wires somtimes it will come back on..Somtimes i can slam the door or hood and it will come back on..I can start it from time to time but if i turn the light's on it dies kill's all electrical..

Any idea's on where to start?

Thankyou..

 

Did you start with the battery cables and connections? Even the posative cable end that goes to the solenoid, all you other feed come from there, and they all need to be clean so they make good contact, also check the ground cables at both ends. Let us know more about it. Did it start this right after the swap? Does it do this all the time? Describe again all that is does and does not due starting with when you turn the key to on, then to start.

 

I have did some work to it tried tracing the wire"s but have not found anything loose or corroded..I had bought the truck with the swap already done and have had this trouble since i bought it..I just paid $900 bones for a motor overhaul it run's good if i could just keep it running..It will be running good then i turn on the lights or even roll down the power window then it will just loose all electrical..Makes no sense to me at all...



Thankyou for your help..

 

try taking the batttery cables off the battery. Clean them and the posts real good. If they been banged a bit, you can take a knife and clean them up, you what the end to slip on and go all the way down to the batterry before you tighten the bolt. If they dont get tight on the batterry, you can remove the bolt, and use a hacksaw, or something, to clean the slot out where it butts together. These things are lead, and very soft, easy to clean up and shape, but they also stretch real easy and often wont tighten down properly.

Then follow each wire coming off the battery to where it connects, and remove and clean that end as well.

The +/hot/pos/red cable will just go a short ways, and hook to the solenoid via a post and a nut. There will be several smaller wires there also. Take each of them off, and clean each one on both sides. scrape it or use a wire brush or file them. Doesnt hurt to clean the nut too. A little oil or grease on all the cleaned parts will help when your all done.

The ground/-/black/neg cable will run from the battery usually to the frame and then the engine. Find the places its bolted, and take the bolt out, and clean both sides of that eyelet, and the place it rests against, it should toach bare metal.

I just sounds like your loosing connection when the load becomes to great.

 

How far are you from nashville, and in what direction? I am only an hour or less northwest

 

I am about 4 hours from nashville about 20 mins from chattanooga...

 

Odd thing is using a test light negative hooked to the negative battery post i have power when i touch it to the positive post..Then i hit the switch and i loose all electrical..Then i touch the probe to the positive post again and the power come's back on..I know this all sound's confusing as it is to me..lol..

 

Ok just got it to start..I stuck the light probe that is attached one end to the negative and stuck the probe into the lead positive battery clamp and it started i took the probe out of the lead post and lost all electrical upon turning the switch......Sheezzz,,.