Replaced the Blower Motor Resistor ...no FAN at any swtich setting Removed FAN and connected both terminals direct to truck battery and it spun Tested for voltage at the blower terminals and had 13.5 volts (fan does not spin when plugged back)
So I have 13.5 volts now at the blower motor leads but FAN not turning. Fuse of course checks good (25A position #12). Is my only option left to be the dash dial swtich ?
I pulled the + and - leads (blue and black respectively) off the blower itself and put a FLUKE digital meter on the leads as I turned the blower switch. I assume the black lead (smaller tabbed wire) is a direct to ground wire ? If I measure from that black lead to a ground / chassis point I should read 0 ohms ?
und connection good on that connector"ndccpf1" wrote in= message
round connection good on that connector"ndccpf1" wrote = in message
bare a spot on the motor and run a temporary ground to the batt. neg. to see. Jerry
bare a spot on the motor and run a temporary ground to the batt. neg. to see. Jerry
Ground tested good. Also ran a separate groiund wire today. Still no fan turning. I now suspect.....FAN switch or is there a RELAY somewhere ?
Replaced dash rotary swtich ($ 29@ GMC). All good now. Strange was that all positions showed 13.5V at the motor and the last position was
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