Quote:
Originally Posted by brcidd
Sounds like a bad connection at a plug- look for burnt/melted plastic at all connections- and yes you tested voltage, but that is only half the circuit- the ground connector and plugs are also trying to carry the massive current required of a high blower setting. This is why a relay is used- to avoid sending high current (amps) through your control head fan selector switch. You can tell which wires carry the high speed by their size. Big wires are for big current, all others are just for controls switching etc..
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Happen to know where the other side of the plug goes to? The blower side plug seems fine, nothing burnt or melted.
Any chance it could be a loose connection on the back of the console screen? I had someone pull that out a while back (was considering if I could mod it) and that was around the same time as the problem starting. Before I waste time and probably break plastic screws holding the screen in, is there it worth looking back there?