Okay so I'm still trying to get the cheap trailer lights from TSCO to work as taillights on Ugly.
Everything works now except for when the parking lights are on and I hit the brakes, the taillights don't get noticeably brighter.
I'm guessing this is because the lights are getting enough juice just with the taillights on, so they don't get brighter when the brake circuit gets activated. Also, when the parking lights are off and I hit the brakes, the dash lights up because that circuit's being activated (this may or may not be a problem).
Here's the quickie diagram...truck has a wire for taillight (red) and a wire for brake (blue), a wire for turn/hazard (green), and a ground (black). Trailer lights have a wire for tail/brake (red) and a wire for turn/hazard (green) and grounds through the mounting posts (yes my grounds are good).
Now can I just stick a diode or resistor on the red wire on the truck side of the splice to reduce the voltage and limit feedback? Am I trying to do something that I can't do?
Here's the pic...TIA