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1986 Bronco Eddie Bauer 5.0 mostly stock
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1,913 Posts
Yea I don't think I have any other relays that are compatible. Wouldn't be the worst thing to try I suppose it isn't like it is expensive. I just highly doubt it is the relay as like I say, it is only a few months old. I do know that the inertia switch on the Bronco was bypassed by the previous owner. Think that could be the culprit?
Buzzing is generally caused by voltage issues, so you may have a bad connector or bad wire or bad ground or a bad relay. As far as the inertia switch, it depends on the quality of the bypass job...if the jumper wire is a corroded flimsy piece of crap then yes, that could be a problem, but if its a good jumper capable of carrying the juice needed then it's probably OK. If i recall correctly, its a pretty good size wire, like a 12 gauge maybe that runs through the switch, so your jumper needs to be that same size.
 

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Premium Member
1986 Bronco Eddie Bauer 5.0 mostly stock
Joined
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1,913 Posts
If i understand the relay correctly, it takes X amount of power to operate the switch inside, and if it don't get X amount of power then the switch isn't happy and instead of staying open or closed, it buzzes like crazy trying to stay one way or the other.

What shape is your charging system in? Have you put a battery charger on and let it do a good long slow trickle charge? you may have a bad alternator or something like that as well. At the very least, id give the battery a long slow charge to full and see if it still buzzes.

Also, i don't know if there are any fusible links in the fuel circuit, but you may want to check them all anyway. I had a fusible link that had gotten toasty, but never completely burnt up on my XLT, it was still providing power to my accessories but not like it was supposed to, i replaced it and everything perked back up and the link crumbled in my hand.
 

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Premium Member
1986 Bronco Eddie Bauer 5.0 mostly stock
Joined
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1,913 Posts
So what exactly was wrong with your old fuel relay harness connector? Had it gotten hot and melted or warped the end and it wasn’t making a good connection anymore? Or was it just crusty and dry rotted?

If it had gotten hot and warped then you still may have an underlying electrical issue. Low voltage or bad grounds and cause the wires to get really hot especially at connectors.


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