Hi - wondering if anyone can offer some advice. I have my 37 gmc electrical back to spec aside from installing turn signals and a right tail light. I want to have my rear park lights on as running lights when the headlights are on. I've read the tech tip showing a jumper from headlight to park lights at the back of the switch, but wanted to still have my park light only position on the light switch work. I was wondering about a diode which I have not used before. I was thinking a 6v diode but not sure.