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Old 01-26-2010, 09:17 PM   #15
Rivet Master
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Corona , California
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Originally Posted by fotochop View Post
Wow, that sounds way too easy! Can I do this safely? Meaning, without a wire heating up and setting the trailer afire?? The wires to that fuse are red and about 1/8 of an inch (sorry, I need to learn my gauges...)

I'll gladly give it a try but may end up calling someone just to feel better about it. I've had other fuses blow at strange times, once while hooking up the light inside the curb storage, for example, where one wire had come loose. I'd really like to know that the trailer is wired correctly, but I've camped in it for a couple years now with no serious electrical problems.

I can only think of one other thing that may not be right. After installing the new heater I installed an LP gas detector by using the hot & ground wires leading to the heater. I just added two jump wires to those and hooked them to the detector. Should I have run dedicated wires back to the fuse panel or something? Thanks for all your help!
Electrical problems, what ever they may be, must first be diagnosed.

Remove the wires for your LP detector, then proceed.

You cannot have any mysteries in the equation, when your trying to find a fault.

Then try the furnace again.

Post again, with those results.


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Old 01-26-2010, 09:40 PM   #16
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2010 30' Classic
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South of the river , Minnesota
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When you are on shore power, the DC system runs on, typically, 14.4 volts, instead of 12.7 volts when you're on battery. If the fuses are marginal - undersized - that can cause them to fail.

You want to use the right size fuse. Smaller wires are used in automotive applications for the same fuse size than in household applications, in part because the 14 gauge=15 amps standard in household wiring is thought to be unrealistically conservative in many quarters, and in part because 12 volt systems are more highly engineered and don't rely on plug-connected loads of unpredictable size.

One strategy to troubleshoot is to go up to 2x the fuse size and connect an ammeter and observe the circuit closely while in operation. The ammeter readings can be used to isolate the problem while the large fuse still provides short circuit protection.

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Old 01-27-2010, 08:00 AM   #17
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post a photo of the bad fuses. a short or a slight overload will blow the fuse differently. try to show the wide side of the metal strip inside. a dry bearing in the motor can cause quite a load when it tries to start to turn.

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