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Old 09-16-2021, 06:45 PM   #1
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1962 26' Overlander
San Diego , CA
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Replace 12V breaker with traditional automotive fuse block?

I believe these are two 12V breakers that run my entire 12V system. Should I replace these with traditional automotive fuses? Are these even AC/DC rated?

I started going down this rabbit hole because in replacing some 12v Edison bulbs, some of the sockets were shooting sparks but not popping fuses (or, as it turns out, breakers).

Advice?
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Old 09-16-2021, 07:04 PM   #2
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Hi

Those are indeed AC breakers. If they are running on 12V DC that's not the best way to do it. You can get 12V rated breakers. I would go that way rather than using fuses.

Bob
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Old 09-16-2021, 10:09 PM   #3
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I would probably replace the whole box rather than try and find 12v breakers in this particular configuration.
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Old 09-17-2021, 07:25 AM   #4
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I have my doubts that you are looking at your 12V system there. Check your converter. If you have an older (original or near-original) Univolt converter, the 12V fuses were built right into the end of the converter.

good luck!
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Old 09-17-2021, 09:19 AM   #5
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If those are magnetic breakers they certainly won't work with DC. I kinda agree with Belegedhel that those probably are AC breakers on the shore lines that feed your Univolt converter. If bulb connections are loose in a socket you can get some sparks without overload if it's just intermittently opening and closing the circuit through the lamp in the fixture. - Brad
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Old 09-17-2021, 10:16 AM   #6
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That looks like your 120v panel box. Here is a photo of the original 12v system in my 66 Tradewind. I could never make any sense out of it. Click image for larger version

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Fortunately I never had any problems with it. I replaced it with a Blue Sea panel box. Easy Peasy. Cost was only about $30 from Amazon. Here are photos.

DanClick image for larger version

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Old 09-17-2021, 10:29 AM   #7
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Quote:
Originally Posted by Belegedhel View Post
I have my doubts that you are looking at your 12V system there. Check your converter. If you have an older (original or near-original) Univolt converter, the 12V fuses were built right into the end of the converter.

good luck!
Agree, it looks like a 120 volt feed (white Romex) and SO cords leaving. One of the SO cords probably goes to the converter for the 12 volt circuits
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Old 09-21-2021, 11:40 PM   #8
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For those of you who have been lying awake at nights, sleepless, since I asked a week ago - turns out it's not Romex. One blue (?) wire feeding 12v + straight from the batteries, one white wire feeding 12v -, and a couple circuits going out.

I will replace with a fuse block per earlier suggestions.

Thanks, all!
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Old 09-23-2021, 05:54 AM   #9
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Hi

12V breakers do exist. There are a lot of brands and types. One very fancy example:

https://shop.pkys.com/Blue-Sea-8025-...rs_p_1769.html

Gives you a cutoff switch for troubleshooting. For many, it's easier to see if one is tripped. They also eliminate the endless searching for a replacement fuse that just *has* to be here somewhere

Bob
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