sister-in-law went to "help" put the battery back in 89 Bronco after starter replacement and put it in backward. Now there is no electric power to anything. I know there are fusable links but can only find the one going back to the ignition from the starter solenoid. Where would I find others. What other damage should I be looking for. all the fuses in the cab are still good.
backward battery
- Thread starter ejones125
- Start date
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I personally have no clue what damage to look for but I would say check the relays. It could have fried your computer from what I have read online. Also every car is different when it comes to this situation, some have failsafes but I doubt any of the Broncos did.
Yo,
Check all battery cables, positive and grounds for corrosion, melted insulation, loose or poor connections, etc.
Is battery fully charged now?
Most fusible links show a melted, charred insulation when they burn out.
Check Fusible Links: A-Brown 18ga to Rear Window Defroster; W-Blue 20g to Fuel Pump Relay; N-Blue 20g to EEC Power Relay; F-Blue 20ga to Trailer; Y-Blue 20ga to N.C.; L-Brown 18ga to ?; M-Brown 18ga to ?;G-Blue 20g to Exterior Lamps, Trailer; P-Blue 20ga to ?; &
***J-Green 14ga to Alternator***
as shown in Wiring Diagram in an 89
Source: by Seabronc (Rosie, Fred W) at http://broncozone.com/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=10377
Fusible Link Location pics in an 85 & 89 (between the starter relay and alternator)"...the first two pics are of an 89 5.0. because of the loom i wasnt able to trace the wires...
***The second pic is at the starter relay to show you a fusible link wire (the green wire in my fingers you can see at the eyelet there is a black plastic block).****
the third pic is of my 85. i think that big block is another style fusible link ford used on older stuff (but im not sure)..."
Source: by shift1313 (Matt) at http://broncozone.com/topic/15953-no-spark/page-2
Read all of it
...
Diode Leakage Test; "...To check alternator diode leakage, connect the multimeter in series with the alternator output terminal when the car is not running. Leakage current should be a couple of milliamps at most; more often, it will be on the order of 0.5 milliamps. Use care when disconnecting the alternator output wire; ***make sure the battery is disconnected first***..."
Source: by assets.fluke.com ==== I'd pull it and take it to NAPA or an Auto Electric Shop.
Check all battery cables, positive and grounds for corrosion, melted insulation, loose or poor connections, etc.
Is battery fully charged now?
Most fusible links show a melted, charred insulation when they burn out.
Check Fusible Links: A-Brown 18ga to Rear Window Defroster; W-Blue 20g to Fuel Pump Relay; N-Blue 20g to EEC Power Relay; F-Blue 20ga to Trailer; Y-Blue 20ga to N.C.; L-Brown 18ga to ?; M-Brown 18ga to ?;G-Blue 20g to Exterior Lamps, Trailer; P-Blue 20ga to ?; &
***J-Green 14ga to Alternator***
as shown in Wiring Diagram in an 89
Source: by Seabronc (Rosie, Fred W) at http://broncozone.com/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=10377
Fusible Link Location pics in an 85 & 89 (between the starter relay and alternator)"...the first two pics are of an 89 5.0. because of the loom i wasnt able to trace the wires...
***The second pic is at the starter relay to show you a fusible link wire (the green wire in my fingers you can see at the eyelet there is a black plastic block).****
the third pic is of my 85. i think that big block is another style fusible link ford used on older stuff (but im not sure)..."
Source: by shift1313 (Matt) at http://broncozone.com/topic/15953-no-spark/page-2
Read all of it
...
Diode Leakage Test; "...To check alternator diode leakage, connect the multimeter in series with the alternator output terminal when the car is not running. Leakage current should be a couple of milliamps at most; more often, it will be on the order of 0.5 milliamps. Use care when disconnecting the alternator output wire; ***make sure the battery is disconnected first***..."
Source: by assets.fluke.com ==== I'd pull it and take it to NAPA or an Auto Electric Shop.
Seabronc
New member
The main thing I would have expected is fireworks when she hooked the positive cable to the ground connection. Probably destroyed the battery. Try another battery hooked up properly. Also may have fried the alternator.
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broncoboyerusa
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Same thing happened to me. But I put it in backwards, it was dark and dirty and tired. But the problems were blown fuses, bad relays, and the most important issue was the computer had a blown capacitor. After all that was replaced truck started right up.
