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Old 02-27-2005, 10:41 AM
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electric fan wiring

Hey, just two questions:

1) What should I use as a keyed 12V source, should I run it onto the fuse panel, or is there a better/closer source

2) how would I wire in the a/c part? Its a 94 ford ranger, the wires are part of a harness. Should I cut it and T it in? THanks, Adam

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Old 02-27-2005, 11:35 AM
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If you have a spare fuse in your panel, that would certainly be best. You just need to find a circuit that is a switched source. Tell us more about the existing system. You are asking about "T"s and existing wire which leads me to believe there is an existing fan.

Chris
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Old 02-27-2005, 12:14 PM
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It had a mechanical fan clutch previously...i bought the relay. There is an A/C wire, but the a/c wire goes to a housing that plugs into the compressor. I just bought t's, so i think i figured that out. As far as the 12V source, my girlfriend just took off with my light in her car, so I can't identify a 12V...what would be my best bet, the batt-starter wire? Thanks, Adam
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Old 02-27-2005, 01:28 PM
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As long as you run a fuse and don't mind the extra visible wires, the there's nothing wrong with taking the power directly from the battery. The problem with going to the fuse box is that you're going to need a dedicated fuse for your fan alone. It cannot be shared with another load as the circuits are precalculated for the fuses used. If you find an empty fuse slot, then by all means use it. But there'll be no advantage (over say going directly to the battery) except for neatness. If you only want the fan to run with the ignition on then you have to install a relay, which is a remote switching device. You'll need to find + power that's only available when the ignition's on. Your ignition coil power supply is one.
So once set up, your relay should have a fused power supply from the battery to relay terminal 30. The fan wire should be connected to relay terminal 87. The 'ignition on' power supply should be connected to relay terminal 86 and the earth wire should be connected to relay terminal 85.
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Old 02-28-2005, 12:09 AM
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In reply to my last post, I remembered an error on my behalf. I said to hook the relay terminal 85 to earth. That's all very well if you don't mind the fan running each time you turn on the engine. What I should of said was relay terminal 85 should be connected to earth via the fan switch, which of course closes the earth circuit when the engine reaches the fan operating temperature zone/window.
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