Manual Radiator fan switch (regarding previous posts) - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 5 (permalink) Old 07-30-2012, 05:07 PM Thread Starter
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Manual Radiator fan switch (regarding previous posts)

When talking about installing a manual radiator fan switch, everyone talks about tapping into the relay in the tail, but why?

Looking at the wiring diagram, that same black wire splits and goes to each radiator fan (sp2), so is there any reason people aren't tapping in at the back of the fan and making this a lot easier on themselves?

Sorry for the general question, there are a lot of heat and fan related posts, I felt updating them all would be spamming subsailor lol
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post #2 of 5 (permalink) Old 07-30-2012, 06:49 PM
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Less amperage if you go through the signal wire versus switching direct through the fan power. The fans are a 20A fuse. The signal comes through the ECM, much lower current.

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post #3 of 5 (permalink) Old 07-30-2012, 08:40 PM Thread Starter
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Originally Posted by Crarrs View Post
Less amperage if you go through the signal wire versus switching direct through the fan power. The fans are a 20A fuse. The signal comes through the ECM, much lower current.
I am still talking about using the ground wire. My point was the same wire that people are tearing tails off to get to, is the same black wire that is located on teh back of each radiator. It seems a lot less hassle and wire routing to just tap into one of the fans themselves. As it's the same wire, your amperage isn't a factor, you are simply grounding in at a different point in the loop.

Was curious to see why this was overlooked as every post I can find (other than this one) mentions going to the relay directly
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post #4 of 5 (permalink) Old 08-01-2012, 08:00 AM Thread Starter
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with all of the posts out there I am surprised no responses to this. This goes back years
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post #5 of 5 (permalink) Old 08-01-2012, 09:12 AM
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I have an SP1 - I don't care!

Seriously tho, I did the lower temp switch mod for SP1, and it's just fine without a manual switch.

John, 2000 RC51 #000100

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