Topic: Regulator/Rectifier HELP

[Aircooledrules]

Does anyone know what PN# SH236-12 is out of. It looks like this one, what model years would it have been used on?

http://cgi.ebay.com/ebaymotors/1981-HONDA-CB750-CB-750-REGULATOR-RECTIFIER-cb900_W0QQcmdZViewItemQQcategoryZ35594QQihZ012QQitemZ220132949416QQrdZ1QQsspagenameZWDVW

And does anyone have a wiring diagram they can post for a bike with this Regulator/Rectifier, Thanks.

[Pinhead]

That would be used on the '79 and up CB650, CB750, CB900, and CB1100. It will work on the earlier models with a little work. Definitely worth it, though, because it's fully electronic instead of the electro-mechanical one that is stock.

Check my sig for another way to hook up a cheap and reliable reg/rec to your bike. The wiring should be the same, though the letter designations would be different.

[Aircooledrules]

Thank you very much, my next question is, What does the White wire do ?

[mark]

The part in the ebay link sold for $35 + stamps - a 26 year old part, most probably.

You should be able to easily match or beat that - with new parts. With better parts.

There are a number of threads on this board related to such improvements.

Happy trails.

[Aircooledrules]

i realize its an old part but i already have one in my spare parts and i need to know ASAP what the white wire does so i can get this working.

Thanks.

[TwoTired]

The white wire goes to the alternator field coil to stimulate a magnetic field.  The strength of this magnetic field determines (in part) how much power the alternator is able to provide for charging the battery.

The green wire is a battery return path to the NEG terminal.

The black wire is a voltage supply from the Battery POS terminal via the key switch.  This is the power that is routed to the white wire output of the Vreg, and is also the sense wire where the vReg determines the charge level or charge state of the battery.

Cheers,

[Aircooledrules]

I mean the White wire comming from this Regulator/Rectifier, There are 4 wires connected to the 1st plug, one black (ground) 3 yellow and 1 White.   The second plug has a Red/White, Green, Black.

I need to know what the WHITE wire does. where to connect it to. THANK YOU.

[Bodi]

What bike?
The white wire is the regulator output to control the alternator output. Most SOHC4 engines have an induced field alternator and the white wire goes to the field coil that's attached to the outer alternator cover. Some engines have a powered rotor alternator with brushes to carry power to it, the white wire would go to one of the brushes.
The other wire from the field coil (or rotor) goes to ground - usually. Some rectifier/regulator units want the field coil connected to +12V ignition power and the white wire. I think the unit you reference should have the other field wire grounded.

[Ibsen]

Also check out this site:

http://www.oregonmotorcycleparts.com/Products.html