I did purchase the pigtails for the relays. My question is the guage of the wiring that comes from the pigtails. From the switch, it looks like a 14 guage +/-, and following the schematic, the pigtail wires from the 86 side for power up and down are a lot lighter guage. Is this a concern, or am I o.k.? The 87 and the 30 sides are a lot thicker guage, similar to the harness and the switch wires.
Haven't visited the board in a while. I hope you've already found an answer.
According to ampacity charts I've seen, 14 gauge stranded wire can carry up to 40 amps in a 12 vdc circuit. 16 gauge can carry 20 amps.
The 86 and 87 are the signal wires meaning that they just tell the relay to actuate(connect) the 85 and 30 contacts so there is very little current passing through the wires going to 86 and 87. They could be as small as 22 gauge (5 amps).
All the power to drive the motors is going through 85 and 30 so they need to be 14 gauge or larger. This is the very reason for this modification. Now, the heavy current draw is NOT going through the switch which causes them to go bad. Now the relay is carrying all the current for the motors.