Rectifier/regulator question

grant · Posted: September 21, 2008, 9:58 am Post subject: Rectifier/regulator question

This may be a foolish question but the electrics seem to evade what few braincells I have left. I am trying to build a tracker, '77 stock motor with points and I would like to simplify the wiring. Headlight, taillight, starter and killswitch only. My question is - Do I have to run the stock 2 separate units or will the block finned later model unit work? Is the block finned unit only compatible with tci ignition? Any help is appreciated and please excuse my ignorance on this matter. Thanks, Grant.

jayel

late model reg/rec will work just need to wire the plug in different if you go to my (jayels album) and find the 650 chopper wiring dia. then look at the 80xs dia. that uses the dual unit reg/rec you will see that the wires match up except you eliminate one ground wire

grant

Thanks, Jayel. Helps a bunch.

georelle

I tried the same thing in my '76 with an '80 rectifier/regulator and it did not work. Apparently the way they regulate the voltage coming out of the alternator is diferent. I ended up doing the Pamcopete's 6.58 rectifier and 25.94 solid state regulator. These upgrades can be found on the XS650 garage fourm under electrical - electrical solutions - charging systems. It works awesome.
Georelle

Jake68 · 650Rider Supporter Joined: Mar 23, 2007 Posts: 841

Me too..

I "UK" ified Pampcopete's setup and its the best most solid charge I've ever had out of a bike.

The UK version of it cost less than £10 all in!

Retiredgentleman

As jayel said you can use the later rec/reg combo unit on your 77. There's one important difference that must be changed. The alternator brushes on the bikes up to 1979 have one brush (right side) grounded, and feed the control + voltage from the green wire to the other brush. From 1980 on, neither brush is grounded............one brush uses battery voltage (brown) and feed the control - ground voltage from the green wire to the other brush. To make this work on a 77, you would need to isolate the right side brush mounting bracket from ground.

LumbeeNDN · Full Member Joined: Jul 16, 2007 Posts: 16

...hey guys, I'm going through this same problem with my chopper now. Currently the way its wired, if I jump the green wire to the (-) batt post the charging will run up to 16v. From what I understand this tells me the rotor and stator and doing there job, but with out the jump, no charge. I've insulated the black wire going to the stator with nylon screws to mount it. When I flip the switch on, should I read any voltage across the brushes? Currently I don't. And to make it more confusing, if I ground one of the probes on my meter to the engine case, then probe each brush with the other, I read 12v on each one. Is that right? Seems to me neither is grounded. Any help appreciated...

Retiredgentleman

LumbeeNDN; I'm not clear on what you are trying to connect. Do you have a combined rectifier/regulator from a 1980 to 83? Are you trying to connect that to an alternator from 1970 to 79?

LumbeeNDN · Full Member Joined: Jul 16, 2007 Posts: 16

...thats correct I have the combined reg/rect and an early model stator.

Retiredgentleman

I recommend you follow the help you're getting from Pamcopete over on 650garage. He is the expert on charging/ignition etc..

LumbeeNDN · Full Member Joined: Jul 16, 2007 Posts: 16

...thanx, I'm trying to be patient Confused

But he hasn't posted in few days now. I've got a new reg/rec from mikes on the way. I'm hoping the one I have is bad, and that getting a new one installed will solve the problem. Thanx for posting...

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