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 Post subject: Re: Main fuse blowing, is it a voltage regultor?
PostPosted: Wed Jul 19, 2017 12:34 pm 
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Amps is (I) I typed it wrong originally.

A fuse is rated as amps e.g. 10 amps. The draw (R) is reasonably constant unless you're flicking lights on and off or turning your heated grips on and off etc so say a headlight bulb, the ecu and a tail light with brake light on totals 144watts (R in the equation) this is constant. If the volts spike to 24V (V in the equation) then we can calculate that the amps (I in the equation) is reduced. Lowering the amps won't blow a fuse.

That said if the voltage dropped to 6v, and with the draw the same then the amps would increase and therefore blow a fuse.




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 Post subject: Re: Main fuse blowing, is it a voltage regultor?
PostPosted: Wed Jul 19, 2017 2:11 pm 
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:?:


Last edited by Bill_Mc on Mon Aug 14, 2017 4:01 pm, edited 1 time in total.

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 Post subject: Re: Main fuse blowing, is it a voltage regultor?
PostPosted: Wed Jul 19, 2017 2:51 pm 
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smokinrider wrote:
Amps is (I) I typed it wrong originally.

A fuse is rated as amps e.g. 10 amps. The draw (R) is reasonably constant unless you're flicking lights on and off or turning your heated grips on and off etc so say a headlight bulb, the ecu and a tail light with brake light on totals 144watts (R in the equation) this is constant. If the volts spike to 24V (V in the equation) then we can calculate that the amps (I in the equation) is reduced. Lowering the amps won't blow a fuse.

That said if the voltage dropped to 6v, and with the draw the same then the amps would increase and therefore blow a fuse.




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The "draw" is current (I) measured in amps

(R) is resistance measured in ohms

Power (P) is measured in watts and has no place in ohms law

V=I R is ohms law, therefore if voltage increases so too does current.

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 Post subject: Re: Main fuse blowing, is it a voltage regultor?
PostPosted: Wed Jul 19, 2017 3:17 pm 
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Whatever. Resistance here is generated by the wattage of the load.

If the volts drop and the resistance or wattage stays the same the amps go up. FACT.
If the volts go up if the resistance or wattage is constant the amps decrease. FACT.

10 amps at 240volts is 2400 watts. 2400 watts at 24 volts is 100 amps.








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 Post subject: Re: Main fuse blowing, is it a voltage regultor?
PostPosted: Wed Jul 19, 2017 3:46 pm 
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Resistance (ohms) and power (watts) are two completely different things and you are confusing the two

If the volts go up the current goes up and vice versa unless of course ohms law is wrong!

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 Post subject: Re: Main fuse blowing, is it a voltage regultor?
PostPosted: Wed Jul 19, 2017 4:26 pm 
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:lol:


Last edited by Bill_Mc on Mon Aug 14, 2017 4:01 pm, edited 1 time in total.

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 Post subject: Main fuse blowing, is it a voltage regultor?
PostPosted: Wed Jul 19, 2017 4:42 pm 
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Maybe my usage of the term "ohms law" is wrong (it is) but the fact remains if volts go up and the load on a circuit stays at a fixed wattage then amps decrease.

Edit..
Having done some google tuition I can see that it's the equations that are similar and my usage of the term "ohms law" to describe what I mean is what's wrong.
But the point I was making and describing was right.

An increase in volts results in a decrease in amps with the same watts
P=VxI
I=P/V
V=P/I and all that.

I've just always referred to that method of calculation, incorrectly as "ohms law" because it follows the similar format as "ohms law" in that each is altered in direct relation to the others.

Apologies for confusion caused.

Even more thought on this has made me conclude that the resistance (wires bulbs etc on the circuit) is the constant, it wouldn't be possible (without some clever circuitry) to make the watts constant.
So you're doubly right,


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 Post subject: Re: Main fuse blowing, is it a voltage regultor?
PostPosted: Wed Jul 19, 2017 4:54 pm 
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The regulator is out of whack (technical term) and will eventually fry the battery

(Just a wild guess)

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 Post subject: Re: Main fuse blowing, is it a voltage regultor?
PostPosted: Wed Jul 19, 2017 5:48 pm 
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smokinrider wrote:
Maybe my usage of the term "ohms law" is wrong (it is) but the fact remains if volts go up and the load on a circuit stays at a fixed wattage then amps decrease.

Edit..
Having done some google tuition I can see that it's the equations that are similar and my usage of the term "ohms law" to describe what I mean is what's wrong.
But the point I was making and describing was right.

An increase in volts results in a decrease in amps with the same watts
P=VxI
I=P/V
V=P/I and all that.

I've just always referred to that method of calculation, incorrectly as "ohms law" because it follows the similar format as "ohms law" in that each is altered in direct relation to the others.

Apologies for confusion caused.

Even more thought on this has made me conclude that the resistance (wires bulbs etc on the circuit) is the constant, it wouldn't be possible (without some clever circuitry) to make the watts constant.
So you're doubly right,


I'll get my coat!


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There is no need to get your coat and that is a very honourable post :)

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 Post subject: Re: Main fuse blowing, is it a voltage regultor?
PostPosted: Fri Jul 21, 2017 3:33 pm 
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An update, been away so not been able to work on the bike until today.
Put a 15amp fuse in, the Trail Tech registers 12.5v, turned on the ignition and the fuse pops (no lights on or starter button pushed). Had a quick look at wiring and nothing obvious so now taking the tank off and investigate further on the wiring.

I have changed the battery and no difference so that's discounted.

Would the rectifier blow the fuse with engine not running?


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