Hello, I was hoping someone could help me, apologies it is a very basic question but I'm confused why the circuit doesn't work.

So I fitted a delay on timer relay to a motorcycle fan circuit. The relay was bought on amazom, model ysxo10 12volt 10 second 40 amps. It has pins 85, 86,30, 87 and 87a.

If I connect the relay to an external 12v battery everything works correctly, the fan switches on after a 10 second delay..
However if I connect the relay to the output from the regulator the relay switches on after 10 seconds, the fan spins slightly and u can hear the relay click off, then it tries again and that cycle continues. The motorcycle regulator gives out about 14.8v and when the fan is connected directly by passing the relay the voltage drops to about 9v when the fan is running.
Could my issue be the drop in voltage when the fan tries to start?

Thank you for the advice and apologies if this question is a bit stupid!
Gary

 

Hello, I was hoping someone could help me, apologies it is a very basic question but I'm confused why the circuit doesn't work.

So I fitted a delay on timer relay to a motorcycle fan circuit. The relay was bought on amazom, model ysxo10 12volt 10 second 40 amps. It has pins 85, 86,30, 87 and 87a.

If I connect the relay to an external 12v battery everything works correctly, the fan switches on after a 10 second delay..
However if I connect the relay to the output from the regulator the relay switches on after 10 seconds, the fan spins slightly and u can hear the relay click off, then it tries again and that cycle continues. The motorcycle regulator gives out about 14.8v and when the fan is connected directly by passing the relay the voltage drops to about 9v when the fan is running.
Could my issue be the drop in voltage when the fan tries to start?

Thank you for the advice and apologies if this question is a bit stupid!
Gary

Apologies forgot to mention the fan pulls approx 1.6 amps

 

Can you draw a schematic of your wiring?

 

Certainly sounds like the voltage drop is the problem.
Maybe the regulator is defective but why not just leave it connected to the battery?

 

Certainly sounds like the voltage drop is the problem.
Maybe the regulator is defective but why not just leave it connected to the battery?

Thank you, no room for a battery (it's a trials motorcycle so no battery to keep weight to a minimum)
The regulator runs the fan fine without the timer relay.....

 

Definitely need to see your wiring configuration.

 

Definitely need to see your wiring configuration.

Coil is pin 85 and 86
12v to pin 30
87 to fan +

 

Where is the delay circuit.
Can you post a link to the module, I can't find it on Amazon.
Is the voltage still at 9volts when the relay is bypassed running the fan?

 

Where is the delay circuit.
Can you post a link to the module, I can't find it on Amazon.
Is the voltage still at 9volts when the relay is bypassed running the fan?

Thank you for your help...
I now see on the data sheet it's operating voltage is 11volts, so I guess that's my problem...

 

I now see on the data sheet it's operating voltage is 11volts, so I guess that's my problem...

That's the problem for sure.
Do they sell a 9 volt or lower version?

 

Thank you for your help...
I now see on the data sheet it's operating voltage is 11volts, so I guess that's my problem...
View attachment 343020

Is there any other solution anyone could think of? Could I possibly use a small battery instead of the relay? This would allow the fan to run on a little after the engine is stopped this eliminating the need for the relay ( I was using the relay to stop the fan from running off I was trying to kick start the engine) it is much harder to start when the fan is spinning.
Is there a particular type rechargeable 12v battery I could use that could charge up from the 14.8v circuit without being damaged?

 

Can you construct a small circuit to replace that relay module?

 

Can you construct a small circuit to replace that relay module?

It would need to be water resistant as the bike is often in streams and bad weather

 

This is my suggestion using this Relay or similar with the circuit below.
All the components can be wired directly to the relay pins and encapsulated for water resistant operation.

 

This is my suggestion using this Relay or similar with the circuit below.
All the components can be wired directly to the relay pins and encapsulated for water resistant operation.
View attachment 343023

Thank you very much, I need a version with 5 or 10 seconds delay on.....
I'll take a look and see if i can find one

 

Do you have room for this Module
The relay on board has a low drop out voltage and should remain activated when the voltage drops to 9 volts.
Will need to install in some type of enclosure.

 

Do you have room for this Module
The relay on board has a low drop out voltage and should remain activated when the voltage drops to 9 volts.
Will need to install in some type of enclosure.

I'll take a look, thank you very much for all your help. Much appreciated

 

What I have not seen so far is any mention of how much current the fan draws when running, nor have I seen any mention of what the current rating the motorcycle alternator is rated to supply. Certainly the relay CONTACT RATING is a big number, and that has confused some folks.
My suggestion is to forget the relay, use a 20 amp toggle switch and control the blower directly. BUT STILL do not expect to power a high current blower from a low powered motorcycle alternator.
WHAT is the current rating of the blower motor, and what is the current rating of the alternator?? AND what is the CURRENT rating of the regulator. THOSE are the numbers that matter.

 

What I have not seen so far is any mention of how much current the fan draws when running, nor have I seen any mention of what the current rating the motorcycle alternator is rated to supply. Certainly the relay CONTACT RATING is a big number, and that has confused some folks.
My suggestion is to forget the relay, use a 20 amp toggle switch and control the blower directly. BUT STILL do not expect to power a high current blower from a low powered motorcycle alternator.
WHAT is the current rating of the blower motor, and what is the current rating of the alternator?? AND what is the CURRENT rating of the regulator. THOSE are the numbers that matter.

Thank you, the fan draws 1.6 amps I did mention that......
The fan ,alternator , and regulator are all fitted to the machine from the factory so they would all be sized correctly.
I'll try a toggle switch to islay isolated the circuit while starting.
Thank you

 

OK, and now I see that the mention of the fan in the post does not appear unless I click on the "see more" note. And I am sure that the start is a kick start, not a cranking motor that would require a battery.
So now a question about why the need to delay the fan?? Does providing the fan power make it harder to start?? Or does it tend to cause some other issues??
My observation is that competition motorcycles, especially trials racers, tend to not include any parts not absolutely needed. I think that includes lights and horns, but I am not sure about that. So I am wondering if either the fan has developed some sort of problem, or if the alternator output capability has deteriorated.
In short, it may be that providing a delay of the fan starting is not repairing the failure that had developed.
OR it may be that adding some other function has increased the load on the electrical supply.