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Blowing Fuse

Posted: Fri Apr 13, 2018 4:05 pm
by bogey
Hi,

I am having an issue whereby the10 amp fuse which the power valve servo is on is blowing. Noticed power valves were not cycling on ignition turn on and traced to the fuse. Replaced the fuse, thought the problem was doves as worked for a few days but now it has blown again.

I would be very grateful for any help or info on what might be causing this.

Re: Blowing Fuse

Posted: Fri Apr 13, 2018 4:30 pm
by phildu31
This fuse also drives fan motor. Take a look at the thermo switch and fan motor. I guess you have something wrong there.

Re: Blowing Fuse

Posted: Fri Apr 13, 2018 5:16 pm
by begbie
phildu31 wrote:This fuse also drives fan motor. Take a look at the thermo switch and fan motor. I guess you have something wrong there.
Thats kind of correct, The servo shares a circuit with the the thermo sender unit (which then operates the fan)
living in Ireland at this time of year cant imagine you will suffer any over heating problems,
disconnect the sender unit and see if the problem persists.
I had this very same problem.

Re: Blowing Fuse

Posted: Sat Apr 14, 2018 10:28 am
by bogey
Thanks guys, read another thread as well where it suggested ithe Thermo switch was the most likely cause of the problem. Are these known to fail? Is there a replacement available Ivor are they the same as any other bikes e.g. the RZ/RD 350???

Re: Blowing Fuse

Posted: Sat Apr 14, 2018 4:21 pm
by phildu31
Your thermo switch is certainly still good.
If thermo switch fails, fan will never run or always run.
Most probably the problem is your fan motor which is probably in short-circuit. So, when thermo switch goes on you blow your fuse.
First, you can bypass the thermo switch. If fan runs : fan is ok, if fuse blows : fan is dead.
Or you can wire the fan directly to the battery.
Or check the resistance of the fan with an ohmmeter.

Re: Blowing Fuse

Posted: Sun Apr 15, 2018 9:30 am
by Rick Lance
If you need a fan in excellent condition, I have several. Contact at <rick@lancegamma.com>

Re: Blowing Fuse

Posted: Sun Apr 15, 2018 12:15 pm
by bogey
Hi Guys,
Thanks for the info. I’ve seen a few posts suggesting it is the Thermo Seitch which they are saying can develop a short, whilst phildu31 you reckon it’s the fan. Haven’t had a chance to wire the fan up direct but just wondering how confident you are it’s the fan, could it be either? Or has past experience show which it is more likely to be?

Re: Blowing Fuse

Posted: Sun Apr 15, 2018 12:37 pm
by phildu31
To bypass the switch, you just have to unplug the connector under the tank.
Then connect the two plugs in the connector with anyhing you have in hand and see what happens.
Very easy to do.
Either fan will start or fuse will blow...
Next step will depend.

Re: Blowing Fuse

Posted: Mon May 07, 2018 5:06 am
by bogey
Hi,

Bypassed the Thermo Switch and the fan runs fine. So new Thermo switch on order.

Thanks for the help/Tips