I am doing a couple mods (OTIS & Auto dimming mirror) and each harness has a circuit (wire) "G5 20DB/WT Fused Ignition Switch Output (Run-Start)". I am looking through the manual to find out where I need to tap these wires into. I read the OTIS howto and it says to "simply test wires by turning the ignition switch to "ON"......" Well I don't want to splice open wires testing until I find one so I was wondering if anyone could tell me one I could use for this.
use a multimeter. neve a "testlight" always test those wires just to be on the safe side. even if the info you get is correct, its a good idea to always check yourself. 10 years in the install buisness has taught me that lesson the hard way about 9 and 1/2 years ago. als ues test leads that have a " bed of nails" on them. the pierse through the insulation w/o leaving the wire bare and exposed.
you don't really need the best multimeter. they can cost upwards of 300 bones!! just a nice one from sears will do more than you could ever need for around 30 bucks. and test leads should be at sears too, if not try radio shack. waytek.com might have some good stuff too.
Follow the harness from the headliner - goes to the top left when looking at the fuse box. Yours probably only has 2 wires, OTIS & mirror will have 4 - DB/Wt, to fuse 14, Pk to fuse 19
Yl/Vt which is the OTIS bus to BCM, and Bk/LG to ground. Yours should have the PK & BK already. Just run the other two from the OTIS to the empty sockets