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Wiring both radiator fans to the main fan wiring, blowing fuses?

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Old May 28, 2007 | 01:54 PM
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KOALA YUMMIES's Avatar
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Last edited by KOALA YUMMIES; Dec 10, 2021 at 06:27 PM.
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Old May 28, 2007 | 02:22 PM
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I don't see you having any problems with this at all, try a 25A though and see if you still have the problem with them blowing out.
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Old May 28, 2007 | 02:34 PM
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Default Re: Wiring both radiator fans to the main fan wiring, blowing fuses? (KOALA YUMMIES)

I would keep a 25A in as well. The OEM wiring should have a rating printed on it. Let us know if anything happens.
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Old May 28, 2007 | 02:57 PM
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Default Re: Wiring both radiator fans to the main fan wiring, blowing fuses? (1badteg)

Agree with the above two posts.
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Old May 28, 2007 | 04:26 PM
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Default Re: Wiring both radiator fans to the main fan wiring, blowing fuses? (neo_)

Worst case scenario is what we electricians like to call 'burn back'. What this is in a nut shell is when the amount of amperage or voltage has exceeded the limitations of the specific gauged copper thus heating it's self up the the point of melting, burning or catching on fire.

There are other factors such as the length between starting and ending point and weather the copper is solid or stranded.

If each fan draws 19.5 amps, then it is safe to say that both will draw 39 amps. Round to 40 amps to be safe.

I cannot remember off the top of my head what gauge the OEM wiring is. I think either 14, 16 or 18 gauge.

With that being said:
#10 has a maximum amperage rating of 55 amps
#12 has a maximum amperage rating of 40 amps
#14 has a maximum amperage rating of 35 amps
#16 has a maximum amperage rating of 24 amps
#18 has a maximum amperage rating of 18 amps

All five have a maximum heat capacity of 194 degreen F.

Here is what you need to do (bare with me as I'm trying to conceptualize the OEM wiring and circuitry):

First we know that the OEM fan switch functions as an electrical switch that is heat activated that when cold, it breaks the electrical circuit to the fan and when hot, completes the circuit to the fan, delivering the fans the proper amperage from the fuse box.

Below is what I would do if you are bypassing the fan switch to have the fans run all the time:
1) Take the OEM wiring and harness that goes to the fans, disconnect it and tuck it away.
2) Run #10 stranded wire from the + battery lead to a toggle switch. OR run #10 from SAFE a 12V switchable source.
3) From the toggle switch or 12V switchable source you need to install another run of #10 then install two 20 amp fuse blocks.
4) From the 20 amp fuse blocks run #12 stranded to each fan.
5) For return wiring it needs to go to ground or back to the battery through another #10 stranded wire. Whichever is safer, presumably back to the battery - lead.

If you see, smell or hear anything odd, disconnect the + lead on the battery immediately and let me know. You still have my Hawaii phone number?


Modified by Haleiwa-Brando at 5:48 PM 5/28/2007
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Old May 28, 2007 | 09:45 PM
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Default Re: Wiring both radiator fans to the main fan wiring, blowing fuses? (KOALA YUMMIES)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KOALA YUMMIES &raquo;</TD></TR><TR><TD CLASS="quote">Thanks for the help everyone! Esp you Brando. I forgot you knew so much about electricity! </TD></TR></TABLE>

W00t! Let me know if you have anymore questions.
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Old May 28, 2007 | 10:17 PM
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Damn... Talk about some information.

to Haleiwa-Brando.
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