Originally Posted by spafxer
Hard to say what voltage since it goes into the ECU.
Get out your voltmeter, unplug your existing connection and read across the 2 wires.. Then find out what the Led's need to operate.. Voila!
I knew this but I didn't want to cut the switch out that I've already installed and was hoping someone knew off the top of their head.
Originally Posted by tahoeacr
Doubt you will find voltage. Most ECU's look for a ground to switch maps.
Makes sense. Ground for one map, no ground (no circuit) for the other. K.I.S.S.
On top of this I've realized that if there was a voltage running through the wire that the LED would always be on unless I had a DPST switch or something like that. Electrical circuits weren't my physics professor's strong point when he was teaching us.