1994 Pickup DLX Extracab 2WD 5spd 22RE. I posted on older truck forum by mistake so reposting here. So here is problem. The idle drops when lights are on or fan on and if both lights are on and fan on high it drops significantly (200 rpm). Obviously it is a load on the alternator and that is putting additional drag on engine. Battery is good (good voltage and load tested). Alternator charging voltage good. What gives? Is there a component that triggers idle up when there is an electrical load? I have a factory service manual but can't figure it out. I fixed my AC idle up issue but this is different. If anyone can identify what parts I should focus on in the pics here that would be helpful. I visually checked the ground at battery and the one from engine to firewall but need to do some resistance checks and other recommendations from post repllies on the other forum (84-85 trucks).