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Electric fan wiring question

Old 2/25/19, 07:58 AM
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Electric fan wiring question

found a new fan for a Sonota - it does not list the amps , but has wiring harness that offers 2 speeds ( I will try the lower speed first to see how it cools ) I needed to trim the sides off but it fits perfect over the single core radiator - gives 1 “ clearance from water pump . I was able to secure it tight with 5 zip ties ( I will add some L brackets soon ) my question is : I want the fan to come on when car is turned on . I bought a 100a relay switch that is pretty straight forward , but I am unclear on a few things . the fan has 2 wires , does the fan get grounded to the car body ? If so , why does the rely need to be grounded ? Also , the “positive trigger” on the relay is simple the ignition wire ( like a car radio or amplifier ?

Last edited by Vert91; 2/25/19 at 08:00 AM.
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Old 3/20/19, 01:30 AM
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IMO, go with a delta current control fan control unit. Easy install and depending on model, can control two-speed OEM fans. Mine is a pulse width modulated variable speed version - it gradually ramps up the fan speed depending on coolant temp. so no need for relays. Did the conversion over 10 years ago (included aluminum radiator upgrade among other things). According to the inaccurate factory gauge, the needle has never gone above the halfway mark.
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