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Old 05-06-2013, 04:43 AM   #1
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Pro needs your help (again)

Every now and then I get stumped(I am human) and I need to reach out for a little help. Below is a fuse/ relay that I found at the umbilical connection on a 1964 Overlander. I was hoping one of you might know how many amps this is? I cannot find any more markings except what you see in the photo. It is wired to the blue brake wire and one leg of the break away system. All the wiring is being replaced due to rodent damage seen in the second and third photos.
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I am hoping some one knows what the amp rating is so I can replace it with a new one. Thank you all in advance.
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Old 05-06-2013, 05:08 AM   #2
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That is a circuit breaker, but the info on the amperage rating is on the other side of it.
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Old 05-06-2013, 05:33 AM   #3
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On the underside? I will take it off the plate and look more carefully. I know what it is and where to get new ones, I just don't know what the amperage is.
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Old 05-06-2013, 05:45 AM   #4
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It really depends on the wire size. If it goes to the brakes (dual axle with 4 magnets), then a 20a breaker would be sufficient.
Some will argue that the breakaway brakes should not be protected by a fuse or circuit breaker, which begs the question.
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Old 05-06-2013, 05:46 AM   #5
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Frank, I think the blue wire was the battery charge line from the tow vehicle in those days. The ones I've seen amp ratings on have been 20 amp.
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Old 05-06-2013, 05:56 AM   #6
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Usual practice is to not fuse a brake circuit. That being said a 4 brake system would peak at about 12 amps.
20 Amps should be a safe number for the charge line as you are not likely to see more than a few amps charging. More if running an accessory off that line.
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Old 05-06-2013, 07:24 AM   #7
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Frank,

Looks like 20amp breaker is the answer!

Any auto place should have them in stock.

Enjoy
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Old 05-06-2013, 08:52 AM   #8
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Usual practice is to not fuse a brake circuit. That being said a 4 brake system would peak at about 12 amps.
20 Amps should be a safe number for the charge line as you are not likely to see more than a few amps charging. More if running an accessory off that line.
IIRC, in my Tech Certification classes we were told to use auto re-set circuit breakers only on the brake lines, never a fuse of manual re-set breaker. This could be an early example of same.......and remember that the over current device (auto re-set circuit breaker in this case) is sized for the wire gauge that it is protecting. 12 AWG =20 amps, 10 AWG =30 amps, etc.
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Old 05-06-2013, 09:13 AM   #9
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IIRC, in my Tech Certification classes we were told to use auto re-set circuit breakers only on the brake lines, never a fuse of manual re-set breaker. This could be an early example of same.......and remember that the over current device (auto re-set circuit breaker in this case) is sized for the wire gauge that it is protecting. 12 AWG =20 amps, 10 AWG =30 amps, etc.
This is what I was taught many moons ago....and what I have always done. SELF-RESETTING is the operative word here.
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Old 05-06-2013, 10:21 AM   #10
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I just came across the very same situation, I found the markings on the side of the housing after sanding down a bit to expose a 25 amp rating, replaced mine with a 30 amp resetting breaker.
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Old 05-06-2013, 02:52 PM   #11
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Sure enough, it is 25 amps...
I think I will replace it with a 20 amp unit. I really appreciate everyone's input on this. Thank you all.
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