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Old 10-24-2018, 04:41 PM   #1
Adolphus
 
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Default Kitchen 15A fuse keeps blowing

Is it just me, or is there a fix somebody elseís gone through for a kitchen 15 amp fuse that keeps blowing? Strange, because it was doing ok for a while. I canít think of anything Iíve changed in that area. Thatís the only pesky fuse problem in the camper.
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Old 10-24-2018, 05:43 PM   #2
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Default Re: Kitchen 15A fuse keeps blowing

Vibration from driving can cause things to damage a cable harness that's pressed against them (by rubbing/chafing).

Does it pop instantly, or only on a (say) weekly basis? (intermittents are *sooo* much fun to track down...)

Does it pop if you unplug everything? (if feasible)

--dick
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Old 10-24-2018, 06:36 PM   #3
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Default Re: Kitchen 15A fuse keeps blowing

Pops as soon as power restored after new fuse. This is with no apparent load (lights and fan switches off)
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Old 10-24-2018, 06:58 PM   #4
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Default Re: Kitchen 15A fuse keeps blowing

Must be a short somewhere....... Either wire, or in an appliance.

I would try disconnecting things on the circuit one by one, at least it would start to narrow down where the problem is.
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Old 10-24-2018, 07:00 PM   #5
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Default Re: Kitchen 15A fuse keeps blowing

Quote:
Originally Posted by Adolphus View Post
Pops as soon as power restored after new fuse. This is with no apparent load (lights and fan switches off)
So it's a "solid" failure... which makes it MUCH easier to chase down with an ohmmeter.

Disconnect AC feeds from any sources (shore power, generator, inverter), leave fuse holder empty, connect ohmmeter probes into one of the kitchen outlets ... should show low (near zero?) ohmage ... now poke around to locate things like loose connections (in the outlet boxes), wires fallen out of wire nuts or crimp connections, investigate RV documentation to see what "hidden" gadgets are also hooked onto that circuit (water heater? water pumps? installed lighting?). Look behind the fuse panel itself, too.
If any of the wires are "outside accessible", look for rodent chewing damage.

--dick
p.s. "should show low ohmage" ... that's when it's failing. If it was happy, the resistance should be very high (or infinite).
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Last edited by autostaretx; 10-24-2018 at 07:12 PM.
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Old 10-24-2018, 07:04 PM   #6
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Default Re: Kitchen 15A fuse keeps blowing

I’m sure you’re right. I’m trying to think where I might have caused it during my ac conversion, and will start by unplugging everything I see that goes to the kitchen lights and fan. I just purchased 15 more 15A back up fuses and probably will be hearing a lot of pops as I go through this exercise :(
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Old 10-24-2018, 07:13 PM   #7
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Default Re: Kitchen 15A fuse keeps blowing

DON'T USE FUSES for the test ... do it UNpowered with an ohmmeter.

(far safer, far more "guidance" as to the cause)

Even a "free from Harbor Freight" ohmmeter is more than adequate for this hunt. (or $15 at any hardware store)

--dick
p.s. consider that you may have more than one problem... and the "fuse test" will only find the obvious one.
It's the UNobvious ones that can impart fatal amounts of current that wouldn't be anywhere NEAR popping the fuse.

p.p.s. ALSO check the conductivity between BOTH sides of your kitchen circuit to the Sprinter's frame metal.
They should be totally isolated. (with a nuanced arm-wave for inverter neutral/frame bonding)
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http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
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Old 10-24-2018, 08:02 PM   #8
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Default Re: Kitchen 15A fuse keeps blowing

All good inputs. Will post what I find. PS.. there were a lot of mouse droppings and small acorns theyíd stored around the wiring when I last took the cabinet down.
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Old 10-24-2018, 08:51 PM   #9
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Default Re: Kitchen 15A fuse keeps blowing

Wire nuts?

--dick
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((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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Old 10-25-2018, 01:48 AM   #10
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Default Re: Kitchen 15A fuse keeps blowing

Hmmm :)
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