RAMbone

I'm an electrical novice so please keep it simple, thanks. I currently have a pair of D2 driving lights on my bumper, 10 amp plasmaglow switch in the cab. I just purchased a pair of D2 hyperspots for the a-pillars. I'd like for all 4 lights to work off one switch. Is it possible to just splice the two harnesses together just prior to the switch without any problems? The total wattage of the 4 lights is 110, total amps is 7.9, 18ga. wiring. Am I going to get off this easy or what? Thanks

14Sport

No. For 8 amps you should be using 12 gauge. Here's a calculator.

Wire Size Calculator

Are you against relays? It would be fairly easy to wire up a relay triggered off the old lights that would turn on the new lights SAFELY. It wouldn't be much more work than what you want to do. I could draw you a schematic if you need one.

RAMbone

Thanks for the help. I'd like to use the existing wiring harnesses which both have inline fuses and relays. Is there some way to just add another relay to the wiring to make it work? Thanks again.

14Sport

Yes. Just tap one of the existing lights power wire to the control circuit of the new relay that came with the new lights instead of using the new switch. Like so...

RAMbone

Looks simple enough, hope it works. Thanks again

14Sport

You're welcome. You should be able to tap the old power wire or the wire coming from the old switch if that's easier for the control circuit since it runs on milliamps. Post up your results so I don't have to wonder.

14Sport

If the wire coming from the old switch is easier to get to then you could also just tap that and feed the new relay control circuit. Like this...

RAMbone

Thanks again.