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post #1 of 5 Old 10-19-2011, 10:54 PM Thread Starter
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help hooking up relay

I bought a hayden 3647 to hook up my electric fan and intended to replace the included 40amp relay with a higher amp 75 one. Now that I have the parts in hand the relay design isnt compatible with the controller. What are my options here? Should i just return the relay and look for different model? Or should I get some sort of spade connectors and make a harness?

Thanks,
Wayne

Hayden 3647

Tyco 75 AMP


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post #2 of 5 Old 10-20-2011, 01:54 PM
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Those wires aren't large enough to handle 75 amps.

If you need to run a 75amp relay you'll want to make sure whole system is designed for it.

What kind of fan do you have that 40amps won't be adequate?


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post #3 of 5 Old 10-20-2011, 07:53 PM Thread Starter
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im pretty much following this guide
Junkyard Electric Fan - FordMuscle

The way i understand it the taurus fan pulls about 30-40 amps under steady operation but much more at startup. The larger amp relay is there to reduce the chance of having to change out relays often.

Looks like in the the ford muscle guide they managed to get a 75amp relay with the same dimensions as the original.
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post #4 of 5 Old 10-20-2011, 08:11 PM
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I see. Well if it's just momentary, then those wires will be okay. I would just use some spade terminals and run wire between the controller and your new relay like you mentioned.

'94 GT, White, Cobra hood & bumper cover, '95R wheels
393w, Vic Jr 60cc, XE282HR, Victor 5.8 EFI, 80# injectors, Hooker LT 1 3/4 to 3", Borla proXS
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post #5 of 5 Old 10-20-2011, 08:19 PM Thread Starter
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Sounds good. Ill see what happens next time I get a chance to work on it.

Thanks,
Wayne
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