Based on my 81 shop manual TS section; Door switches only provide a path to ground, which activates the delay timer & to turn on the Ctsy Lights. The two door switches only provides seperate ground paths to activate the delay timer. The timer gets power from the 20 Amp Gages Fuse, pink/black wire and on the orange wire from the "CLK, CTSY 20 amp Fuse". If power at timer checks good w/ a test light, at the timer connections. Plus other wire connections at the timer are in good condition and the black wire (gnd) is verified good, also dis-connect and reconnect the connections at timer. If this doesn't correct the problem, then the timer become the prime failure suspect. A good rule of thumb with older electrical connections, always dis-connect, check for dis-colored, burnt, broken, deformed, contaminated contacts, etc and always double check all recent work areas for security & correctness.
Dealers:
