So I'm bypassing the rear window relay on my 89 4runner and running a fusible line off the battery, but I got a few questions here though. The OEM switch is dead, so I got a new switch and ran it from a charger to the window motor and everything works fine, the problem is my rambunctious dogs. I can see them hitting the toggle switch (it doesn't matter where I put it in the cab) and running the battery dry. So I'd still like it to run from the ignition so the power's off when I'm gone. But when I test the voltage at the original lines, what I get is
8.9 vdc at R-W
8.9 vdc at R-Y
and 8.9 vdc at Blue-R with neg. at ground.
So none of the existing is running the motor. AND, when I tried one of the combos the head lights went out, there was, what sounded like an electric motor running, then dying, when I tried to turn them on again.
This is my first time diving this deep into Toyota electrical, and I need some help. Cheers.

 

See if you can get a copy of the 89 electrical manual making the job lots easier

In 88 the rear power window relay is powered off the 15 amp engine fuse if that is the case in 89

power your window switch with that fuse.:jessica: