My son has a 1989 GMC pickup that he just bought and we can't find the ignition timing bypass wire. I understand it should be a tan wire with a black stripe. I had the same on my 1987 GMC and it was located at the firewall between the distributor and the master brake cylinder.
I looked around in the 89 truck and can't seem to find the wire.
Anyone know where it could be located?
Thanks