Headlight problem--very strange

[rrintscout]

I need some help.

I have an 89 Pickup that has problematic headlights.

For the last two months, the frequency of the headlights working as steadily diminished from 100% to 0% of the times attempted.
When they were working 50/50, they only came on when the truck was warm. The park lights and blinkers work fine.

Also, the weird part, if I turn the truck off but leave the headlights on for more than two minutes the truck will not turn over, seems like no juice to starter. After a few minutes with the lights off, the truck starts up.

I have replaced the relay and checked my battery cables and ground. Please advise with any help.

Thank you.

[Kyle4130]

just check all the wiring that run to the lights. check on the fuses to.