I have an '81 cadillac deville and
my headlights will not come automatically on at night and I replaced the twilight sentinel amplifier. that did not fix it so I also replaced the eye. still no luck. I discovered when I pull the eye out with the ignition on, they work ok. if I put the eye back in, they will not work. this is why I thought it was the eye.
any help would be appreciated.
thanks.
Jim

 

New or used parts. Photocell(eye) should have corrected it. You could try to OHM test photocell should have a high resistance value when covered.

 

the twilight sentinel amplifier was NOS (new old stock) and the photocell eye is new and I tried the OHM test on both photocells and they both go from low resistance uncovered and when covered has a high resistance. it does not appear to be the photocells
thanks for your reply and any other ideas you may have would be welcome

 

on the connector to the photocell .. what is the voltage across the harness connector when ignition is ON ?


.

 

I checked the voltage across the harness connector like you suggested and with the ignition on the headlights come on. I don';t get a voltage reading when I turn the sentinel headlights to off position I get a reading across the harness connection of about eight volts.
thanks again