Ok, got my taillight flasher installed a couple weeks ago. Overall am very pleased with it. Clean install, everything's hidden, and gets everyone's attention.

BUT there's a slight pulsing that you can only notice when slowly coasing with the lights activated. To make a long story short, when the backup lights turn on, it's backcharging the transmission and telling it that's it's about to go into reverse 2.4 times a second (the rate of blink). So I've got to install a set of diodes inline with the backup light wire, before it splits to both of the taillights.

So my question is, does anyone know where the split is, and the easiest way to access it those wires prior to the split? It's after it comes out of the transmision, but I'm not sure where it enters the cab.

Would really appreciate some help if anyone knows. Maybe Electroken? It gets kinda nippy laying under a truck when it's 30 degrees out. Maybe somebody has a manual that tells?