I'm trying to find which one of these wires provides power. I have a test light that works but when I attach my red wire to the brown and then ground, with the key on but engine not running, the light does not turn on. Which one of these wires provides power?
You should splice into the red/white wire as this is the power source for the oxygen sensor from Fuse #4. The brown/white wire goes to the ECU. I'd strongly recommend not using Scotchlock connectors especially on connections that are exposed to the elements.
Power for what?? You should not be 'splicing' into any of these wires to obtain power for anything. Two wires power the Lambda Heater and the other two are the signal wires, the black being the 'feedback' signal that the Ecu processes. Also the 'scotchlock' splicing connectors need to be in the garbage bin asap. They are not reliable.
I want to add a cig. lighter adapter so that I can power my tire inflator in the event of a flat in the middle of nowhere. I've since realized that the harness that I was tapping into is the MOSS adapter and not the one designed to provide accessory power. I used that connector as a test to confirm that it would give me power with key on. It seemed like the least obtrusive way to get to the wire without damaging the insulation too much. I've given up on this project as I will just connect the cig lighter adapter directly to the battery should the need arise.
Ahhh...so you're talking a 8+ amp device. Your cigarette adapter to the battery is the better way to go. Tapping into an existing line with the kind of load from an inflator is a recipe for disaster. I personally went a similar, but refined route by running a wire from the battery to a Powerlet setup and simply replaced the end of my infiltrator from the yukky cigarette adapter. Bonus: When I'm not using the inflator (which is about 99.9% of the time) I have this handy power source for my tank bag.
For your requirements a simple fused outlet would suffice. For those who require to fit more accessories then a Fuzeblok is the way to go - Safe and simple. It connects directly to the battery, contains a safe relay which is 'switched' by an auxiliary wire and each outlet has its own fuse.
