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Electrical question: 2 fuses operate together in parallel?

dirtdivaca
Explorer
Explorer
So while trying to troubleshoot power draw issues in our trailer, we discovered that two fuses seem to be running in parallel (or in series) as I think is the proper technical term? :@

In our 2014 R-vision travel trailer, we found two interior lights and power awning all tied into Fuse #1 and Fuse #10 in our fuse box. If you remove one of the fuses, the power to these items still works. It is not until you remove both fuses that the power is disabled. They are 15 amp fuses, so my question is this a safety issue? We are concerned that by running in series, they might be drawing 30 amp power and the wiring is not 30 amp (as we believe) and the fuses are not 30 amp. Is this a standard design done on Travel Trailer? :h We are also concerned that this might be fire safety hazard since the fuses won't trip properly if there is oversurge of power due to parallel design. I'm not EE so I apologize for posting a newbie question.

Unfortunately the Mfgr is out of business and we're not sure if this is a design flaw or not? Dealer doesn't have justification to charge to our extended warranty to look into this since we don't have a "failed" item to claim on it.

Anyways, I would love to get some input on if this is OK and why would mfgr do this? As we understand it, the power awning doesn't need 30amps to operate. Or does it?

Thanks much!
31 REPLIES 31

Chris_Bryant
Explorer II
Explorer II
I would look closely at the wiring to the awning, which was likely added aftermarket- someone wired something wrong.
-- Chris Bryant

mike-s
Explorer
Explorer
Wiring fuses in parallel, as you describe, is not proper. You're correct that it could allow up to a 30A draw, which the wiring is unlikely to be rated for. It should be fixed.

Wiring fuses in series (along the same circuit) is fine.