175A megafuse keeps blowing out
#1
175A megafuse keeps blowing out
Alrighty I've read up a lil and it's saying that usually there is a short of some kind on the charging circuit to cause this. The fuse isn't melted or anything like that it just keeps blowing out. I've put a couple of them in there so far. Is there anything else besides a short that could cause this? I'm pretty sure there isn't a short anywhere. I did leave the ground strap from the body to the hood undone which i just corrected but I don't think that has anything to do with this. Could it be a bad alt?
#5
#6
Old Guy User…
iTrader: (12)
What numbers should I be looking for at which rpms? I'm gonna have it tested pretty soon. It blows intermittently sometimes it's a couple days or even sometimes a week or so. It's only blows engine running then the battery light comes on. So it just stops charging the battery.
Once you have determined that your alternator and the battery are good, no bad cells in the battery, then you can proceed to checking out the wiring.
BUT since it shorts over time not right away, as the others have stated it is probably a back alternator, partially shorted or just getting dirty inside and will need to be replaced. Get it tested first and then decide.
Don’t waste your time trying to determine what amperage at what rpm, just take it there and get it done.
#7
But with the "amazing build quality" of alts these days I'd start with the alt. I remember I replaced one under warranty at the Ford dealer only to have the new one not even putting out 7v. If you do get a new one, do yourself a favor and have them test the new one before you leave.
#9
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#11
Well I currently have a couple other issues to work out but its stopped blowing the fuses and started simply to cause the battery light to come on and have the alt not charge the battery. When disconnected it seems to reset and everything seems to work fine again for about another 250 miles and does the same thing over again. Seems pretty strange.
#12
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