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Old 12-30-2015, 10:56 AM   #1
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Electrical Short

I have a Forest River Flagstaff Classic pop up model T12RBST with a dead short in the electrical system. I'm sure the short is in the DC circuit #6 of the WFCO model WF-8735/8740 power converter because when I pull that fuse, the short goes away. Can anyone help me with this problem? I don't know what the #6 circuit controls but I do know that the radio, exterior and interior lights don't work when I pull that fuse.
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Old 12-30-2015, 11:24 AM   #2
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Is that fuse blowing when you insert it?

Sounds like that fuse controls a lot of the power through the unit.

Have you tried unhooking the radio from the power wiring and see if it's the problem?
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Old 12-30-2015, 11:26 AM   #3
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Quote:
Originally Posted by stuckinchina View Post
I have a Forest River Flagstaff Classic pop up model T12RBST with a dead short in the electrical system. I'm sure the short is in the DC circuit #6 of the WFCO model WF-8735/8740 power converter because when I pull that fuse, the short goes away. Can anyone help me with this problem? I don't know what the #6 circuit controls but I do know that the radio, exterior and interior lights don't work when I pull that fuse.
Hi the first place I would look is at the lights. A light bulb may have burned out and shorted when it burned out. The bulbs get very hot and may have damaged wiring insulation causing a short in the light fixture.
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Old 12-30-2015, 11:32 AM   #4
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Quote:
Originally Posted by stuckinchina View Post
I have a Forest River Flagstaff Classic pop up model T12RBST with a dead short in the electrical system. I'm sure the short is in the DC circuit #6 of the WFCO model WF-8735/8740 power converter because when I pull that fuse, the short goes away. Can anyone help me with this problem? I don't know what the #6 circuit controls but I do know that the radio, exterior and interior lights don't work when I pull that fuse.
Confused. If there were a dead short in that circuit, the fuse would blow unless the short was prior to the fuse, in which case none of the equipment on that circuit would work since all of the voltage would go to ground and likely you would have a melted power wire to that circuit. I think we need a better description of your symptoms to be of much help.
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Old 12-30-2015, 11:55 AM   #5
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Originally Posted by limblips View Post
Confused. If there were a dead short in that circuit, the fuse would blow unless the short was prior to the fuse, in which case none of the equipment on that circuit would work since all of the voltage would go to ground and likely you would have a melted power wire to that circuit. I think we need a better description of your symptoms to be of much help.
I agree. A dead short as you describe would blow the fuse in that circuit.
I'm not sure if in your description you mean by pulling the fuse the short goes away or if you mean you are pulling the blown fuse and because the fuse was blown the short is gone.

A better explanation would be helpful.
If the fuse does in fact blow, then you will need to start checking all the items you listed that do not work that are on that circuit with the fuse blown/removed.
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Old 12-30-2015, 12:42 PM   #6
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He might be saying the main breaker to the convertor is blowing with that fuse in it doesn't mean he has a direct short might be a overloaded converter I.E. battery low pulling a lot of amps then other circuit adds up to trip point when you pull fuse it might drop amps enough not to trip breaker.
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Old 12-30-2015, 06:49 PM   #7
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Sorry about the lack of information in my earlier post. I'll do my best to explain what I'm finding. With the battery cables connected, and the #6 fuse in place and everything off in the camper, my battery drains extremely fast which is why I started this investigation. I've installed a brand new battery and it drains just as fast as the old one. With the battery disconnected my meter indicates a dead short to ground when connected to the positive wire that is normally connected to the positive side of the battery. That ground indication goes away when I disconnect the #6 DC fuse in the power converter panel. At the panel, I am showing a dead short on the downstream side of the fuse. The positive side of the fuse shows no short so I'm assuming the short is downstream of the power converter. The strangest thing is that the #6 fuse does not blow. I have no way of measuring amperage but it seems to me that something should blow given the amount of time it's taking to drain a brand new battery. At no time did any of the 120 circuit breakers trip nor did any fuses blow. Thanks for any help.
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Old 12-30-2015, 07:05 PM   #8
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OK much clearer now. You will not get a meaningful ohm meter reading when measuring at the battery terminals with battery disconnected. There are several things in most all RV that are always powered on unless you have a battery disconnect switch immediately after the battery. Please define what you mean by "Kills the battery fast" The Propane/CO detector will kill a full battery in a relatively short period of time ( approx a week). More than likely the detector is on fuse #6. If you are going to leave the RV unattended for more than a week, you should disconnect one of the battery terminals (I like neg terminal) or add a battery tender if you have shore power available.
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Old 12-30-2015, 07:11 PM   #9
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Thanks Flybob. My battery dies in a matter of hours, not days or weeks. I was aware of the Propane/CO detector but didn't think that was the problem because I figured it didn't draw that many amps. I have kept an automatic battery charger on it for the past few days while trying to figure out the problem. Today, I left the #6 fuse out and have seen no significant loss of voltage in my battery.
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Old 12-30-2015, 07:25 PM   #10
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Is your Refrigerator the Three way 12V 120V gas I know on my old fiver that was what it had and if you used the 12v side it would drain the battery in a matter of a few hours. I know some pop ups had this type of fridge but the only other thing that can pull that amount of amperage is a invertor. otherwise don't know what could pull a battery down that fast a direct short would blow fuse if not at fuse than short would get red hot in just a few seconds seen it happen once on a old gas tractor I was using shorted to gas tank and was glowing before I killed the power.
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