I'm trying to diagnose a problem with my Overdrive on my 86 Toyota pickup with a 22R, and of course automatic transmission. I solved two problems with the system already. First the wires connecting the shifter switch were cut. No problem rewired the switch. Then replaced the bulbs in the Overdrive light. Now the switch activates the Overdrive light but not the Overdrive itself.
So I'm trying to find a wiring diagram, online if possible to find out where it actually activates the Overdrive. Can anyone help? Should I be looking at the transmission or the distributor?
TIA,
JW