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If I could switch to the newer connectors then I could use this FCM. Honda Fourtrax Foreman 350 D 87 Fan Control Unit 38710-ha7-671 31435 Good Usable Condition. Honda Fourtrax Foreman 350 D 87 Fan control unit 38710-HA7-671 31435 123.99 Product Details Manufacturer Part Number 38710-HA7-671 Shipping Our mission ... Honda View product details $123.99$123.99.Used +$6.82 est. tax eBay - powersportsnation Free delivery by Tue, Jan 11

I agree, OEM is the way to go and I am going to use an OEM fan control unit. Honda discontinued it and I don't trust used electronics. I'm trying to use what OEM still makes. Here are an 87 trx 350D and a 95-03 trx 400FW schematics, what is the difference, except the connectors?

I have a 1987 Honda trx350D. The fan control unit malfunctioned, discontinued and the only NOS is 400.00. The 1995-2006 TRX400fw has the same schematic as the 1987. The only difference I can see is the 87 has a 6 individual wire pigtail and the 95-06 uses 2 plug in connectors with a total of 6 wires. I want to modify my 87 atv harness from 6 individual wire pigtail to the 2 plug style. I can figure out the 2 wire connector is the thermal sensor, the 4 wire plug is another story, which wire goes to which terminal? Any Ideas?