Burro Fuse Issue - Fiberglass RV
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Old 07-19-2023, 07:32 AM   #1
Junior Member
Name: Marie
Trailer: burro
Posts: 10
Burro Fuse Issue

I have a 1989 Burro that will blow a fuse when one front lamp is on with no other draws. This happens on battery and shore power. I changed out the bulb, took the fixture down and checked the wiring. All good. The light will stay on for apporx. 10 minutes before blowing the fuse. The fuse powers the ceiling fan and all light fixtures on the right side of the camper. I did find the owners manual for my convertor box. According to the manual for Parallax we should have 20 amp fuses. My husband is very concerned about switching out the fuses since we only have problems with just the one light. Currently we have all 15 amp fuses. So do we change out the one that keeps blowing with a 20? Take the bulb out of that lamp and never use it? We are the 3rd owners and have no contact with the previous owners so no way of knowing what kind of problems they had. My convertor box is a Parallax Series 3200, Model 3220, Code C639.
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Old 08-15-2023, 09:39 AM   #2
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Name: Jack
Trailer: Scamp 13
Posts: 256
I would not change to a higher amp fuse for fear of starting a fire. Has someone in the past added something to that circuit? It seems strange that one lamp alone on a 15 amp circuit would blow a fuse. Is the wiring at that point the sane gauge as the rest of the wiring leading up to that point? Could there be a pinched wire leading to that point? Can you measure the voltage at that lamp socket. Does it differ from the rest of the circuit leading to that point?

Use this site below to determine the actual load on the circuit involved.

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Old 08-15-2023, 06:54 PM   #3
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Name: Charles
Trailer: Bigfoot
Posts: 391
You install fuses based on wire size. You probably have 14 gauge wire supplying the 12v DC circuits and thus would need 15 amp. Sometimes you might use smaller fuses on single load circuits such as a LP leak detector. If you have a high draw item that has heavier wire, then a 20 amp may be warranted, such as an electric awning.

You have wiring issues that need to be resolved.

The owners manual is probably trying to tell you to not use more than 20 amp fuses, though I was unable to find any wording to this effect in the manual I have (from the Parallax web site)

3200 Series Owner Operator Manual

Here is what the PPS 3200 owners manual says about the 12v DC Distribution Panel (fuse panel)

A DC Distribution Panel is installed in front compartment of Converter—or is located adjacent to Converter. This panel contains circuits with replaceable fuses for protection of RV 12-volt light and motor lines.
If any line is loaded beyond the capacity of its fuse, the fuse will “blow”. A portion of the 12-volt load on the line—lights and/or motors—must be turned off to reduce total load on the line below the capacity of the fuse. Replace fuse with same size fuse. DO NOT put in larger fuse than indicated. If this reduction of load on the line does not stop the “blowing” of the replaceable fuses, there may be a “short” along the 12-volt line or at a nonfused 12-volt motor on the line. Check the RV 12-volt line and equipment on the line. Locate the “short” and take the necessary steps to repair it.

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