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Q: no power to heater swwitch on 1992 Ford Tempo

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I have purchased a 92 ford tempo. The relay behind the glove box has gotten hot enough to melt connector slightly, the blower motor has been hot wired to battery, and I want to repair heater
as it should be. I need to know main power source for heating system. The 30 amp fuse is all right, but after that everything is dead, there is no power at heater power switch. The mode panel
will change to different positions, but everything else seems dead. What is main source of power from heater switch to blower motor. blower motor works, I ran wire from it to battery. what am I missing, where do I start?
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