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Buell Motorcycle Forum » Quick Board Archives » Archive through July 22, 2007 » Wiring gremlin, blowing relay's « Previous Next »

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Tod662
Posted on Thursday, July 19, 2007 - 08:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Fan quit running on the R1 I am trying to resell(2 very interested parties want to see it saturday)(thats why I posted here). anybody out there good with wiring or can direct me to a good technical R1 website? (I have looked)

this is what i know: Fan quit working
-Fan works direct
-all fuses are good
-temp sending unit ohms are close when cold ond warm(160deg.=.5k 0deg.=3.8k supposed to be .2-.4 warm and 2-4 cold)
-took idenical relay out of headlights, plugged into fan, fan did not work, plugged back into headlight, headlight didnt work
-somehow burnt up a relay instantly, every thing else was plugged in correctly, all wires havce continuity(all ive checked)
any ideas I do not understand how a second relay could go bad instantly
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Barker
Posted on Thursday, July 19, 2007 - 09:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I hate gremlins



Are you sure the light and fan relays are the same. Sounds like something outside of the relay. Look real close for some kinda short, melted burned wires/plastic.
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Tod662
Posted on Thursday, July 19, 2007 - 09:26 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I know the relays are the same, have looked over wires pretty good, next step would be to start cutting away wrap and tape
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Wile_ecoyote
Posted on Thursday, July 19, 2007 - 09:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Check to see if fan is obstructed with pebble bird also you can test fan by wiring it direct to battery after disconnecting it. If a relay burns up you have a short or grounded wire. A short could be in a pinch point. Look over anything youve done. A wire thats bad will look it. It'll have burned spots on it.
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Diablobrian
Posted on Thursday, July 19, 2007 - 11:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Some of those gremlins are pretty mean....Gremlin X with a 304 is a very light car and will embarrass the unsuspecting


I think that the gremlins in lightweight SCCA racing with the 258(?) were forced to run restrictor plates in the 70s because
they were decimating the big 3's cars in the class.

Yes, I used to own and even race AMCs. My tastes ran more to AMXs and Javelins (68-74) though.
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Damnut
Posted on Friday, July 20, 2007 - 07:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Wiring gremlin, blowing relay's


Why would you wire a gremlin or blow a relay......... that must taste like shit.
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Reepicheep
Posted on Friday, July 20, 2007 - 08:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Only way I can think to kill a 12 volt relay in a 12 volt system would be to put too much load through the load contacts. The switch input side of the relay should be impossible to kill, it would just turn it on or not.

Are you sure the fan relay *was* identical to the other relay you cooked? Or had somebody before you put in the wrong one?

Unless there is some sort of goofy voltage regulator problem, or Yamaha did something goofy feeding more then 12 volts to parts of the system (which would let them use smaller diameter wires for high loads, but is asking for trouble). I doubt they did that.

Maybe something mechanical as well, could a lead be getting gooeied up or bent?

Or could the blowing relay also have blown another fuse somewhere, so you didn't really kill the relay, it just looked like it because you blew a fuse?
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Bake
Posted on Friday, July 20, 2007 - 09:43 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

hmmm, which side of the relay is not working....

coil side
contact side
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Tod662
Posted on Friday, July 20, 2007 - 11:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

2 dealers have confirmed that the relays are the same
Voltage on both hot wires is 12.47, same as the headlight relay plug
the return wire to the computer that is grounded to turn the fan on shows no continuity to the battery which i understand means no short in (that part of)the system
both hot leads come directly through 15 amp fuses
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Reepicheep
Posted on Friday, July 20, 2007 - 01:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Do the relays have an amp rating on them? How much current is the fan drawing?
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