Scotty370
Platinum Member
- Joined
- Dec 18, 2008
- Messages
- 898
- Location
- Buffalo, New York
- Tractor
- 318 John Deere, 4200 John Deere, 1947 John Deere "M"
How long did you have it reversed? Smoke=Bad!
How long did you have it reversed? Smoke=Bad!
As an EE I'm not sure time matters much. Any components damaged by reverse polarity and not high current would probably be damaged in way under a second. Many engineers,, myself included usually design for reverse polarity protection. The ones are that is difficult to design for are the high current circuitry to solenoid and starter, but that should not have been energized. Lights, wipers, fans etc don't care. Computer's and the like are easily protected with a single diode or a diode bridge. I would think JD would have them. If some high current pulled enough current to smoke I would like for burnt wiring and blown fuses.
I'm less sanguine about reverse-bias diode protection, I'd bet there isn't any. It's common enough elsewhere, sure, but I doubt it in this application. Have been wrong before, could be wrong here, but...............
Good luck!
I'm an electronics tech and we have an old saying in the business.... Everything electric runs off of smoke but when you let the smoke out, things quit working! I would try Kenny's suggestion first, make sure the battery is NOT the problem by trying another known good one. If it still doesn't crank, then you might have burned a wire in two, but it could be covered by the insulation. That would make it tougher to fix meaning you'll have to trace it down with a meter. If you haven't already figured it out by now, inspect the wiring and everything else tied to the wiring VERY closely. Good luck. Let us know what you find out. It could help someone else here.
As an EE I'm not sure time matters much. Any components damaged by reverse polarity and not high current would probably be damaged in way under a second. Many engineers,, myself included usually design for reverse polarity protection. The ones are that is difficult to design for are the high current circuitry to solenoid and starter, but that should not have been energized. Lights, wipers, fans etc don't care. Computer's and the like are easily protected with a single diode or a diode bridge. I would think JD would have them. If some high current pulled enough current to smoke I would like for burnt wiring and blown fuses.