SwitchPros wiring, blue wire to?

Wanting to get this wrapped up this evening. The blue wire on the SwitchPros needs to go to an ignition hot location. I already have an add-a-fuse in the ignition slot under the hood. It is connected to the LEDs on the headlights with 7.5 fuse. Can I tap into that wire and put in a bigger fuse? If that's a dumb idea, where else do I go?

 

"Connect the blue wire for the ignition sense signal. This can be any signal that supplies a 12v signal when the ignition is switched on."

They've included an add-a-fuse with a 15a fuse. I could use cigarette lighter under the dash, yes?

 

If you need to tap into an existing ignition circuit but can't (you shouldn't) increase the fuse size; The trick is to run that tap to the coil of a relay. The other side of the relay coil goes to ground. One switch contact goes from +12 battery through the appropriate fuse size for the load. The other switch contact of course goes to the load. This trick allows you to use ignition as your triggering source, but run higher current directly from the battery (through a fuse of course) to your load.

Now all that said, the blue wire to which you refer, may in fact be doing exactly as I described, in which case you should be able to tap into your existing fuse tap. Check with the manufacturer to determine if this is the case.

 

Its just an ignition sense. Dont worry about the amperage, it wont draw much. Just connect it to any positive wire that is powered when the ignition is on.

@Spolar decided to connect his to the fog light positive. Then his switch pro will be on when he turns on his fog lights.

 

So I used the A/C fuse under the dash. Everything looks good. Next project is the light bar in the hood scoop.