86 302FI Electrical problem
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Joined: Sep 2001
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86 302FI Electrical problem
I have an 86 Bronco XLT with the 302 FI. Something has been draining the battery if it is parked for more than 24hrs. Nothing is on and I replaced the battery and it still happens. I checked all wires that run through the fuse block in the cab and there is no current draw. With everything turned off I see a .17mA draw going down a fuse link from the terminal block. The only wiring diagram I have shows all wires from this link going to the alternator...can the alternator be drawing current and draining my battery? does anyone have a better wiring diagram that shows where else the current may be going?
Posting Guru
Joined: Jun 1999
Posts: 2,415
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From: Comox Valley, Canada
86 302FI Electrical problem
Yes the alternator and or regulator can drain the battery if they are bad.
Disconnect the battery negative wire and hook your ammeter between the negative battery post and the negative wire. Disconnect the alternator and see if the current draw goes away. Then do the same with the regulator.
If you still see a draw try pulling fuses till it goes away. At least you can see what is drawing the current this way.
Good luck.
Sparky
Disconnect the battery negative wire and hook your ammeter between the negative battery post and the negative wire. Disconnect the alternator and see if the current draw goes away. Then do the same with the regulator.
If you still see a draw try pulling fuses till it goes away. At least you can see what is drawing the current this way.
Good luck.
Sparky
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Joined: Jan 2001
Posts: 56,997
Likes: 2,744
From: Virginia
86 302FI Electrical problem
The main connection point for all the electrical is the large starter solenoid terminal that goes to the bat positive. You can start there and see if it leads you to the alt circuit, or up into the dash area etc.
