Electrical issue furnace, porch light, water pump for out door sink.

[RVforwork]

Seem to have an interesting issue. Started with noticing porch light above door won’t turn off. The winter came tried turning on gas furnace. The furnace will not turn on. Pulled fuse to check reinstalled furnace came on ran heated but won’t cut off with temp on thermostat and continues to run and run. I then pulled fuse again to kill power to furnace to shut down furnace and noticed porch light works as advertised with fuse pulled. Reinstalled fuse furnace off porch light stays on again switch won’t turn off. This then led to yesterday looking in storage bay saw water. Investigated slide out grill and sink has pump and tank to puch sink water to holding tank. Pump is non operational.

Everything else seems to operate fine. I am wondering if all three are linked by a common ground or if one component shorted out and took that circuit down becoming the ground. Not sure if there is more information I can provide.

2019 Solitude 373FB-R

[howson]

RVforwork,
Without knowing your depth of knowledge in advance, if my reply seems basic please don't be offended--only trying to help.

+12vDC is passed across the porch light switch on the Convenience Center when the light is turned on. (See diagram 1 below.) When turned off, only one side of the switch has +12v.

If the porch light is staying on when the switch is turned off, either the switch is bad or the porch light is getting +12v from somewhere else (the latter shown in diagram 2). It is not a short to ground or the fuse would blow. It's a short from one +12V line (source) to the porch light +12v circuit.

If I was troubleshooting with a multimeter I'd start with that assumption.

Please be careful when working with electricity--it can and will "bite". If you doubt your ability, consider having a professional find and fix the problem. (Is your unit still under warranty?)

-Howard

P.S. Basic diagram is from howtogeek.com which I then edited for the purpose of this issue.

[RVforwork]

I will go check out now. I’m used to working on aircraft but they are built to spec and much easier to trace issues. Thank you for replying.

[JCR GD]

Just FYI, when I was working on my panty light I found the switch at the light was wired on the neg/ground side. So don't bet on all switches installed on hot side.

[RVforwork]

So checked it out must be tied in elsewhere to 12v system. Checked at switch and light. Seems my issue with 12v to furnace is tied together. Just not sure where the power wires tie them together with no diagram have to pull it all apart.

[howson]

So checked it out must be tied in elsewhere to 12v system. Checked at switch and light. Seems my issue with 12v to furnace is tied together. Just not sure where the power wires tie them together with no diagram have to pull it all apart.

I mapped out the AC side of my unit, but not the 12vDC side (yet). You might consider taking a few minutes to document what-works-off-what before continuing. Below is an example. All I did was use the floorplan from GD's website and then pasted over symbols.

Good luck with the hunt!

[RVforwork]

This was a good start and I’ll add what I find as I go. If I had the time to drop it off I would and let the shop fix it as it is under warranty. But seems a simple wring issue. Just have to run it down.

[Country Campers]

Being as this concerns your furnace there was one I read where the wire to the furnace was to close to the furnace fire box and had melted. Maybe check the furnace area , hard to get to the back of it but may be a clue.

Brian

[OffToHavasu]

Try a couple of things. One, go to the light fixture and pull the bulb. See if that changes the furnace. If nothing changes, take the furnace completely out of the loop (disconnect the wires) see if that changes anything.

[RVforwork]

Out of town for holidays. Pulled bulb no switch works like on off like it should. Also to note turn porch light switch off A/C and furnace wall control turns off. Turn switch on they come back. Furnace also works with bulb out switch on. Is it possible light fixture is internally shorted together? Without bulb should porch light switch illuminate?

[OffToHavasu]

So here's what I think is going on. Power is coming through on the ground side of the bulb. When the bulb is in, it's acting like a fuse. If you put in a smaller wattage bulb and ran the furnace, the bulb will probably.

Now with the bulb out, put a volt meter positive lead on the ground side of the bulb housing. Then put the negative lead to a ground on the trailer. You'll probably see voltage. If you do, you need to trace down the ground side of that bulb wire and see how it's getting tied in to positive.

If it's not, there's something funny at the switch.