Elec Fan Switch Mod

[Eagle]

Looking at Hornbrod's diagram, I forgot that the Renix fan used a fusible link. That's the wire that supplies power to the fan (not to the control/switch side of the relay). You are testing with the ignition in the RUN position, right? Do you have 12 volts on that red wire coming into the relay (terminal 30)?

 

And I see I was wrong about the diode ...

[agamble]

i did have the key in the RUN position when I was trying this. When I checked the power (relay 30) I was unable to get power. I chased quite a few wires to check for a shorts, checked both relays but unable to get the fan to operate. I conceded defeat and wired the fan to a new switch and relay, it's accomplished what I originally wanted, except it's no longer tied into the A/C system. A/C never worked anyway. The compressor kicks on but I don't think the system is charged. I've not bothered fixing it as I don't run A/C, never liked the feel of the artificially cooled air. I originally bought the truck there were lots of randomly done splices, for the most part I have removed/fixed them. In this recent event I found a ground spliced via wiretap into the A/C wiring harness, why and for what purpose a previous owner only knows. As I am not messing with the A/C I left it be. Thanks for all of the input and help, you made what was confusing to me at first make much more sense. I would not made it as far as I did without all your input.