This is topic Elec Fan won't turn off in forum Tech Talk at Northern California Ford Owners .
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Posted by Big Dave (Member # 13142) on
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Hey CA fords, I have an elec fan from a lincoln, a summit racing thermostat in the thermo housing, a switch from the solenoid/battery, all connected to a 30 or 40a relay.
2nd random time now, the fan won't turn off, even when I disconnect from the thermostat. Is my switch failed?
Posted by 5.0 LsX (Member # 10017) on
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prob relay going bad
Posted by BTLD GT (Member # 5229) on
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Sounds like the relay contacts welded together.
Daniel
Posted by Big Dave (Member # 13142) on
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Thanks that makes sense seeing that the wires to the controller are very hot right now. Starting to deteriorate.
Wonder which came first? I must have something wired wrong. Never had this issue before, could the fan draw too much for the wiring?
Posted by *Als50* (Member # 6003) on
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It sure in the hell does! Get yourself a 75amp relay!
Posted by Big Dave (Member # 13142) on
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Good grief!! No wonder
Thanks for the tip!
Posted by Big Dave (Member # 13142) on
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Ok question, where do people get a 75amp relay from with the 4 wires?
Posted by Big Dave (Member # 13142) on
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Sounds like with a dual speed fan, the recommendation is to run 2 40amp relays (one for each speed) and then to a 75amp off the battery.
Like this:
https://bzerob2.wordpress.com/2011/11/15/ford-taurus-2-speed-fan-install/
Dang that's much more work and parts than I planned.
Posted by *Als50* (Member # 6003) on
:
Go one ebay. It's a Tyco 75amp relay.
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