I marked this OT because it is in regard to the wife's minivan. Her vehicle has a defect in the circuit board that controls the heat and A/C systems. Believe it or not there are actually 2 webpages out there devoted to troubleshooting the Nissan Quest / Mercury Villager minvans! It seems that the current draw of the rear blower motor overwhelms the board and the following occurs:
"A little more info on this topic from a circuit board design point of view. Based upon the great photos, it is apparent that the cause of the failure of the circuit is the inadequate size of the circuit board trace from the landing pads of the 8 GA wires to the relay terminals. The + terminal is broken and happens to be the smaller of the two traces. The large current draw is overheating the copper trace and it loosens from the circuit board substrate - well you know the rest."
So, they recommend the following:
"A better remedy to this situation is to increase the effective conductor size to the relay by placing a short jumper between the landing pads of the 8 GA. wire and the relay terminal on the underside of the board. This will give the current an alternate parallel path and reduce heating because of an overall larger equivalent conductor size. Simply resoldering the board will remedy the problem only if a lot of solder is used and bridges the conductive path to the relay and landing pads. A better solution would be to install these jumpers to increase conductor size."
My question is how do I make this repair? Does the copper wire have to touch the board or can I lay down a puddle of solder and then stick the wire in it and throw down some more solder to secure it? Any recommendations on wire or solder type? I have a soldering gun and 2 types of solder (high and low melting temps) but only have experience with soldering wires together.