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Old 10-27-2020, 09:43 PM   #1
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Electrical issue

I have a strange electrical issue that has me baffled. When I switch the main interior lights on, it blows a fuse. When I push the awning in button, the main lights work, even with a blown fuse. I detached all the wires from the awning switch and the main lights work as they are supposed to.
Can the awning switch have gone bad even though it works to roll out the awning and retract it as well and is somehow shorting the main light switch via a common wire to both switches?
Any help would be appreciated.
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Old 10-27-2020, 10:11 PM   #2
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Quote:
Originally Posted by Mikehbar View Post
I have a strange electrical issue that has me baffled. When I switch the main interior lights on, it blows a fuse. When I push the awning in button, the main lights work, even with a blown fuse. I detached all the wires from the awning switch and the main lights work as they are supposed to.
Can the awning switch have gone bad even though it works to roll out the awning and retract it as well and is somehow shorting the main light switch via a common wire to both switches?
Any help would be appreciated.
Do you have some kind of remote control system that controls both of those?
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Old 10-27-2020, 10:44 PM   #3
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No, i do not.
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Old 10-27-2020, 11:24 PM   #4
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I would guess short awning to lights some where. Is the fuse for the lights smaller than the fuse for the awning. If so maybe when it powers the awning and the lights it is over the fuse rating and that is why it pops.
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Old 10-27-2020, 11:34 PM   #5
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They are both 15 amp fuses. The breaker pops on its own as the awning switch isn’t activated when it goes. In fact, when the awning switch is pushed to retract the awning, it works properly and the main lights go on simultaneously.
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Old 10-27-2020, 11:53 PM   #6
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Very odd. Are your lights led? Led are polarity sensitive where incandescent are not.
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Old 10-28-2020, 02:44 AM   #7
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You need an electrician or someone that knows how to use a voltmeter. You have a problem with the wiring. I'm gonna guess that the awning and the lights are not on the same circuit.
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Old 10-28-2020, 08:36 AM   #8
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Yes they are led lights. Correct, they are not on the same circuit.
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Old 10-28-2020, 08:44 AM   #9
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If I can’t find the short could I pull the hot wire from the awning switch, secure it somewhere and run a new hot wire to the awning switch?
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Old 10-28-2020, 08:54 AM   #10
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Does not sound like it is in the feed circuit to the awning switch due to the lights only working when you operate the awning.if they only come on when the awning button is pressed in i would start with that wire. First place I would look for a short is the control panel, behind mine is a wiring mess.
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Old 10-28-2020, 08:58 AM   #11
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Makes sense. I’ll start at the control panel then check under the motorhome.
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Old 10-28-2020, 10:59 AM   #12
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I am in the wiring jungle behind the control panel and nothing is obvious yet. Since it’s the black wire on the awning switch that is the culprit, it makes it super difficult to trace it since there are multiple black wires back there.
Here is an interesting find. When I pull the fuse for the awning, it still pops the main light fuse when that switch is turned on. The only way it doesn’t pop is when I disconnect the black wire from the awning switch whether the awning fuse is in or not.
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Old 10-28-2020, 01:00 PM   #13
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Just a shot in the dark I would look at the wiring at the awning pivot points. Could be the switch but very odd that the awning operates correctly.
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Old 10-28-2020, 02:13 PM   #14
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It appears the wire that feeds the light circuit is somehow connected to the awning switch circuit. These circuits should be totally independent of each other.

I am just guessing but this cross connection may be at near ground potential when the awning switch is not being used. Maybe the connection is somehow being routed through the motor windings when the motor is in a static state. This would cause the fuse to blow.

Did this all of a sudden start to happen? Has anyone recently played with the wiring? Are the switches next to each other?

You will have to find the connection between the awning switch and lighting circuit. Make sure there are no extra wires connected to or touching the awning switch terminals.

The reason the lights come on when the awning is activated is that 12 volts is then being fed to the lighting circuit via the wire that feeds the awning motor. Somehow these things are connected together. If the switches are near each other I would look there first.
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Old 11-14-2020, 02:09 PM   #15
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Sorry for delay in response as I had to step away from it for awhile. Anyway, everything was working fine for 3 plus years. No messing with the wires and the switches are very close together. I have taken the switches out and inspected the wiring and found nothing.
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