Reg/rec wiring - SV650.org

andrewsmith · 10-12-13, 02:27 PM

Afternoon org

I'm re-positioning the Reg/rec on the bike, and it needs the cables extended about 1 metre. What gauge cable would be best for doing it?
The reg/ rec is a MOSFET FH012 and its on a curvy?

Thanks in advance

Andy

Grant66 · 10-12-13, 06:48 PM

Have a look at

http://www.powerstream.com/Wire_Size.htm

Think the diodes (in the regulator) are 45 amp, so 5mm should be ample.

10-12-13, 07:14 PM

As you're having to chop into the loom to extend, measure the wire sizes when you do.
strip back the insulation, and measure the copper diameter. This should do you. Do it per wire though. If you know the current output, or have access to an AC/DC ammeter, you could see how much is drawn on the three phases, and the rectifier output on full load, this would tell you for sure.

Ruffy · 10-12-13, 10:06 PM

From memory, the alternator rated max. output is 300W. At 12V that's 25A, so 3sq.mm cable should be more than ample. Technically, I suppose, the alternator output wires could be smaller being a 3phase system, and it wouldn't surprise me if what is fitted is actually smaller than that, but I reckon larger is better than smaller (simply to avoid unnecessary volt drop and heating losses) and these are hardly large conductors so not difficult to work with.

As others have said, matching the existing as near as you can is a good rule of thumb but remember that modern vehicle wiring tend to use thinwall cable that is higher rated so may be smaller cross sectional area.

andrewsmith · 10-12-13, 10:34 PM

From memory it's 3 mm thin wall on the alternator.
The fh012 r/r is 50a rating so I'm going to order something around the middle of the two figures

Sent from my ST25i using Tapatalk 2

andrewsmith · 12-12-13, 02:06 PM

Been doing a bit of checking on lunch about the Alternator rating. It is 300W on a curvy (upto 370 on the Pointies and DL's and 400W on the SV1K).
So I'm going to order up the parts

squirrel_hunter · 12-12-13, 06:00 PM

Quote:

Originally Posted by andrewsmith

I'm re-positioning the Reg/rec on the bike, and it needs the cables extended about 1 metre.

Where do you want to position it, and why?

12-12-13, 06:12 PM

Probably for better airflow, they can get quite hot which causes failure, unless they're MOSFET types.

andrewsmith · 12-12-13, 06:12 PM

The plan is to move it to near the front cylinder, the reason it's too big for the the original r/r position

Sent from my ST25i using Tapatalk 2

squirrel_hunter · 12-12-13, 06:19 PM

What one are you using?

10-12-13, 02:27 PM	#1
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Reg/rec wiring Afternoon org I'm re-positioning the Reg/rec on the bike, and it needs the cables extended about 1 metre. What gauge cable would be best for doing it? The reg/ rec is a MOSFET FH012 and its on a curvy? Thanks in advance Andy __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

10-12-13, 06:48 PM	#2
Grant66 Member Join Date: Nov 2007 Location: Preston Posts: 652	Re: Reg/rec wiring Have a look at http://www.powerstream.com/Wire_Size.htm Think the diodes (in the regulator) are 45 amp, so 5mm should be ample. __________________ Formerly known as Gajjii Previous Bikes: Red Sk1 Curvy, Red MT-07. Current Bike: Black MT-09.

10-12-13, 07:14 PM	#3
atassiedevil Guest Posts: n/a	Re: Reg/rec wiring As you're having to chop into the loom to extend, measure the wire sizes when you do. strip back the insulation, and measure the copper diameter. This should do you. Do it per wire though. If you know the current output, or have access to an AC/DC ammeter, you could see how much is drawn on the three phases, and the rectifier output on full load, this would tell you for sure.

10-12-13, 10:06 PM	#4
Ruffy Member Join Date: Aug 2007 Location: nr. Ashby-de-la-Zouch Posts: 321	Re: Reg/rec wiring From memory, the alternator rated max. output is 300W. At 12V that's 25A, so 3sq.mm cable should be more than ample. Technically, I suppose, the alternator output wires could be smaller being a 3phase system, and it wouldn't surprise me if what is fitted is actually smaller than that, but I reckon larger is better than smaller (simply to avoid unnecessary volt drop and heating losses) and these are hardly large conductors so not difficult to work with. As others have said, matching the existing as near as you can is a good rule of thumb but remember that modern vehicle wiring tend to use thinwall cable that is higher rated so may be smaller cross sectional area. __________________ Spannering the wife's SV650S K5 pointy in Black, and son's SV650 X curvy in Blue. RIP SV650 X curvy, crashed and written off December 2019. I'm (procrastinating about) fixing up an old Yamaha FZ600 to get myself fully back on the road.

10-12-13, 10:34 PM	#5
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Re: Reg/rec wiring From memory it's 3 mm thin wall on the alternator. The fh012 r/r is 50a rating so I'm going to order something around the middle of the two figures Sent from my ST25i using Tapatalk 2 __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

12-12-13, 02:06 PM	#6
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Re: Reg/rec wiring Been doing a bit of checking on lunch about the Alternator rating. It is 300W on a curvy (upto 370 on the Pointies and DL's and 400W on the SV1K). So I'm going to order up the parts __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

12-12-13, 06:12 PM	#8
atassiedevil Guest Posts: n/a	Re: Reg/rec wiring Probably for better airflow, they can get quite hot which causes failure, unless they're MOSFET types.

12-12-13, 06:12 PM	#9
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Re: Reg/rec wiring The plan is to move it to near the front cylinder, the reason it's too big for the the original r/r position Sent from my ST25i using Tapatalk 2 __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

12-12-13, 06:19 PM	#10
squirrel_hunter Member Mega Poster Join Date: Apr 2005 Location: Sunny Swindon Posts: 3,571	Re: Reg/rec wiring What one are you using? __________________ "A little enthusiastic?" May I add here, GG is awesome and I think I am in love with Stretchie...he rocks my world! SH2 \| 2MA \| GROM \| YSR

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