hey yall, first time posting couldnt find the thread i was looking for so maybe i can get some help here i have a 79 long bed p/k if i run my headlights to long or i have my heater on too long my turnsignals stop working im thinking the relays are just old and getting hot but today i went out and started my cold truck and nothing!!. about ten minutes later they worked until i turned the headlights on. Any ideas and input would be grateful.