The Ford Barn

Bruce Adams · 06-15-2017, 08:42 PM

I have had an in-line 30-Amp fuse between my 6 volt Alternator and the horn for fifty thousand miles without problems UNTIL LATELY.
Lately it blows while either driving or with the battery switch off, or maybe just prior to the switching off. It is independent of engaged hi or lo headlights, parking lights or horn. I note that I have a small coolant leak at the rubber hoses which I will address tomorrow in case it finds the fuse or wire.
This evening while driving, it blew with the lights on, and I saw them just turn off without a flare beforehand.
Yesterday it blew, I think when parked, on a 90 degree day. It did not blow at night, lights on, on the fifteen mile trip home, 75 degrees.
Sunday it DID NOT blow on a twenty mile drive in heavy traffic on a 90 degree day,
Last week it blew twice.
I had some body shop work on the R/F Fender two weeks ago, requiring its removal.

The 30 amp fuse at the starter has never blown.
I would appreciate your considered thoughts.
Thanks for your thoughts.

06-15-2017, 08:42 PM	#1
Bruce Adams Senior Member Join Date: May 2010 Location: Northport, NY Posts: 1,597	I have INTERMITTENT Fuse Blowings I have had an in-line 30-Amp fuse between my 6 volt Alternator and the horn for fifty thousand miles without problems UNTIL LATELY. Lately it blows while either driving or with the battery switch off, or maybe just prior to the switching off. It is independent of engaged hi or lo headlights, parking lights or horn. I note that I have a small coolant leak at the rubber hoses which I will address tomorrow in case it finds the fuse or wire. This evening while driving, it blew with the lights on, and I saw them just turn off without a flare beforehand. Yesterday it blew, I think when parked, on a 90 degree day. It did not blow at night, lights on, on the fifteen mile trip home, 75 degrees. Sunday it DID NOT blow on a twenty mile drive in heavy traffic on a 90 degree day, Last week it blew twice. I had some body shop work on the R/F Fender two weeks ago, requiring its removal. The 30 amp fuse at the starter has never blown. I would appreciate your considered thoughts. Thanks for your thoughts.