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Automotive switch wiring question

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dwysywd

Well-known member
Joined
Sep 21, 2014
Messages
892
Location
SE Michigan - Romeo area
So, I knew this would be challenging, but I'm hitting some road blocks.

Items: 3 way toggle switch, relay, and HID lights.

Goal: wire the lights for on, off and on w/ headlights. That way if I turn my head lights off they go off (& on when on) and I can override with the flip of the toggle.

So far, stuck! Lmao!

My 3 way switch has 3 wire posts. My relay has 4. My headlight is normal gen1 ram.

Any diagram and/or even hand drawn would be helpful.

I wasted a half hour on this tonight when I should have been installing my truck carpet!


Sent from my bag phone...




Sent from my bag phone...
 
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larry_g

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Joined
Apr 28, 2007
Messages
16,860
Location
oregon
Is your switch a 3 position switch? If it is an on-off-on then connect the center leg of the switch to the relay coil. One outer leg of the switch will go to 12v and the other outside leg will go to the 12v out from the light switch. So flipping the switch one way will turn on the lights, center off and the opposite way lights will only come on/off with the headlight switch.

lg
no neat sig line
 
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justsam

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Joined
Aug 20, 2010
Messages
1,267
Location
Penngrove, California
Do you want HID lights to be able to be turned on when either the high or low beams are active?

The diagram shown will provide for low beam only, which is fine if that is your objective.

I am assuming that you are using a center OFF toggle switch, looks like S2 is existing light switch.
 
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nehog

Well-known member
Joined
Jan 2, 2010
Messages
7,935
Location
Jaffrey, NH
aandpdan said:
Depending upon the year of your Ram the headlights may always be hot and the negative side switched.
Click to expand...

Good point, that may be true. BTW, auto makers who leave the circuit hot and switch the negative side should be shot. Never ever leave a circuit hot: high possibility of fire if shorts develop, and increased corrosion caused by electrical potential differences.

justsam said:
Do you want HID lights to be able to be turned on when either the high or low beams are active?

The diagram shown will provide for low beam only, which is fine if that is your objective.

I am assuming that you are using a center OFF toggle switch, looks like S2 is existing light switch.
Click to expand...

There are various laws on additional lights, and DOT specs call for aux lights to be active only with low beams (WTF?) That said, our VW (an 88) the aux lights are on with the high beam (nice, lot's of light) and I prefer it.

Yes, S2 was the existing light switch. I drew it as a typical configuration.
 
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