Tried to jumpstart another truck, hooked the cables up wrong & I think I blew a fuse. I have no idea which one. Any suggestions?

well doing that blows up electronics.
fire your jump man and send them, the bill.
here is what to do.
check all fuses. first, as in ALL , all in cab and all in engine bay
then scan the oBD2 port at drivers knee's scan it and see what blew up.
or get it can fixed in a real shop.

This doesn't sound like a car, but more like a riding mower or something.

Anyway, is it the magneto that "blew" or a fuse for the magneto? You don't mention that you replaced the magneto....

Some manufacturers incorporate reverse protection diodes that are supposed to cause a fuse to blow if the battery is hooked up backward. Unfortunately, the diode often becomes a short circuit when this happens and would explain why a primary fuse would blow again, even when the battery is hooked up correctly. If you have a wiring diagram for what you're working on, I'd suggest checking for a diode connected near the battery cables. If you don't have a wiring diagram for this, you're probably going to need one.

No guarantee it will work. The only way is to try it and see.

For a fraction of a second many hundreds of amps will have flowed and that sort of current is likely to destroy any electronics not protected against reversed polarity.

You might be lucky...

You will have to do whatever it takes to fix the fuse from digging the bits out and cleaning up with great patience and small tools, bypassing it from under the fusebox with either a suitable in-line fuseholder and fuse or a suitable fusible link.

Good luck!

Open fuse box under hood, inspect main fuse probably blown. May be labeled 80A,100A or 120A.

Hi, first thing to do and if you know location of the fuse box take light tester and test each fuse may you find some fuses blew. change theme first. if you change the fuses and the the problem for each item you describe still on that mean damage went to the items you say.

find the fuse that says radio and replace it

you need to look at the fuses in the under hood fuse box f you look at the center of the fuse and see if the line is broken in the center if so its bad

Did he connect the cables wrong? I would have the alternator tested. I've seen bad alternators blow there fuses. If the cables were hooked up backwards, it may have damaged the alternator.

you will have to replace that fuse first then re try it, good idea to charge the battery with the cables off if you have to wait and get the fuse.

It is possible that you have melted a fuseable link. These are heavy guaged wires coming off the positive battery cable. Their purpose is to protect the electric system in the event of such a case.


If you would like to correspond further with me on this or any other issue, please feel free to do so.
Bill
ASE Master Technician