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Old 08-04-2011, 08:44 PM   #1
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4.0 conversion Vs FAN

Ok, so I just finished installing the Taurus 3.8 fan on my 1990 YJ with the 4.0 conversion. UGH!! I blew the 20 amp fuse for the fan. Will it be O.K. to install a bigger fuse and if so what should size of fuse should I use. Any suggestions would be awesome. Thanks

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Old 08-04-2011, 08:50 PM   #2
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I belive that the fuse for the fan on the taurus's were 50 amp. And you can install a larger fuse IF the wiring you have is large enough to handle it. What gauge wire is running from the fuse panel to the fan?

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Old 08-04-2011, 09:56 PM   #3
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You need proper wiring to be able to do it. I also think it might only be a 40 amp fuse too. Do you have everything set up properly with a relay to turn the fan on and off from the temp sensor?
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Old 08-05-2011, 09:23 AM   #4
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The relay is set up properly from the temp sensor. The fan kicked on for a second at 220 degrees. As soon as it kicked on the fuse blew. I will have to run bigger wire from the fuse box. The current wire is 18 gauge. I have some 14 gauge wire in the garage, do you think this will be big enough?
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Old 08-05-2011, 09:28 AM   #5
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would he need a wiring diagram? The Mitchell 1 Product History
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Old 08-05-2011, 10:10 AM   #6
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14ga will handle a 40a load just fine. Having the relay is key too to not fry the switch, so sounds like you would be all set after upgrading the wiring.
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Old 08-05-2011, 03:24 PM   #7
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When those fans first kick on they draw about 33 amps.
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Old 08-05-2011, 04:11 PM   #8
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I bet they pull at least twice that on startup, your gonna need at least a 50A relay or solenoid to handle that fan.
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Old 08-05-2011, 09:06 PM   #9
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Thank you everyone for the help. I am using the PDC from a 1992 Cherokee (4.0, harness and computer are from the same Cherokee) There was an unused 40 amp fuse for the rear defrosters that I wired for the fan. The fan kicks on at 220 degrees and cools the engine back down to about 190 before shutting off. That 3.8 Taurus fan is an excellant mod.

Thank again.

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