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Old 08-19-2016, 04:06 PM   #1
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help with a light switch in a circuit

I have my trailer gutted and am re-doing some 12V wiring.
the below pic shows ground and hot wires going from the distribution box then giving a wire off to a kitchen light and USB over to the street side; a branch to a fan; then to a dinette light in front; then to a switch on the curb side which goes to three overhead lights down the center. My questions concern the switch to the three center lights:
1. Is this wired correctly? I want to be sure turning the switch off and on won't affect the other lights in the circuit. Also, for the ground, can I take a short cut and instead of the ground going all the way back to the switch after connecting with the three center lights, can I just connect it to the ground back to the ground wire in the ceiling center right after the front (bottom) light?
2. What kind of switch - SPDT?

Thanks,
Greg
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Old 08-19-2016, 04:46 PM   #2
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You do not need to switch the ground so a spst switch on the positive will work. There is no need to run ground to switch.
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Old 08-21-2016, 03:46 PM   #3
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Thanks Al. So for an SPDT switch, just leave the ground connection empty? Would this be the case for any circuit with a switch?
Greg


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You do not need to switch the ground so a spst switch on the positive will work. There is no need to run ground to switch.
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Old 08-21-2016, 06:13 PM   #4
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Greg

A single pole single throw is simply an on or off switch. A single pole double throw is an A or B switch. If you leave one terminal empty it will function as a spst.
The "extra" terminal has nothing to do with the ground and you would blow a fuse (hopefully) if ground were connected to switch as it would be a dead short in that position.

The center terminal is the "input" and outer terminals are A and B.
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Old 08-21-2016, 08:15 PM   #5
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Simpler explanation, only your blue line needs to go to the switch. Your black line just continues straight to the lights. It looks like you know to wire the lights in parallel.
If you look at a light switch in your house you'll see the same thing on all but the 3 way switches. The black goes in and out of the switch the white is wire nutted to itself. Don't feel like you need to look with 120v in there!
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Old 08-22-2016, 11:31 AM   #6
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Thank you HiJoe and Al!
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Old 08-22-2016, 03:32 PM   #7
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The center terminal is the "input" and outer terminals are A and B.

Can also be wired the other way with the center as the output to the load and the other two terminals as different supplies. Not typical in a house but can come in handy in an RV.
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