Stock Rectifier?

gus99 · Posted: April 12, 2009, 8:20 pm Post subject: Stock Rectifier?

I finally got around to removing my old rectifier and was surprised to find this one. It has all of the right wires but sure looks goofy. Is this stock on a 79 special? Thanks...

gus99 · Posted: April 12, 2009, 8:40 pm Post subject: Re: Stock Rectifier?

I just looked it up, it is the stock rectifier and Yamaha wants $230.00 for the stock replacement. I'm sure glad I made my own for $10.00. Sorry for the dumb question. I've just never seen one like it.

xsleo · Posted: April 15, 2009, 4:58 am Post subject: Re: Stock Rectifier?

They used that rectifier on all the early models, pre single unit rect/reg. Yes, building pamcopete's Radio Shack rectifier is a good replacement.

Retiredgentleman · Posted: April 15, 2009, 5:49 pm Post subject: Re: Stock Rectifier?

gus99;
Yeah, that's the same one I had in my 78SE. Original still working fine but I replaced it before it fails out on the road. The original electrical components (Hitachi) were very well made. I know, someone is going to jump on me and say the alternator rotors were crap. But, I'm still using the original rotor Smile

NateDogg · Posted: April 17, 2009, 8:55 pm Post subject: Re: Stock Rectifier?

Im having a charging issue with my 78 standard with stock reg/rec. Are you suggesting this might be the culprit over the alternator? It has new brushes in it to but no chargey

NateDogg · Posted: April 17, 2009, 9:08 pm Post subject: Re: Stock Rectifier?

How can I test the regulator to see if it's good or not?

xsleo · Posted: April 17, 2009, 9:25 pm Post subject: Re: Stock Rectifier?

The repair manual tells how to check the regulator.

pamcopete · Posted: April 17, 2009, 9:50 pm Post subject: Re: Stock Rectifier?

NateDogg

The easiest way to test the regulator is to bypass it. If your alternator produces an output without the regulator, then the regulator is most likely defective.

To bypass your regulator, unplug the regulator and use a jumper wire with a 10 Amp fuse inline from the battery plus to the green wire brush. Have a voltmeter connected to the battery and start the engine with the jumper in place. The voltage on the battery should climb to 15 Volts at 2,000 RPM.

DO NOT LET THE BATTERY VOLTAGE GO ABOVE 15 VOLTS!

Shut off the engine if and when the battery voltage gets to 15.

pamcopete · Posted: April 17, 2009, 9:52 pm Post subject: Re: Stock Rectifier?

RG,

WOW...that's a really big heat sink!! Those rectifiers are gonna last forever!!

Edit: Keeping the rectifiers really cool does,in fact, reduce the drop across them, so you will actually get greater current output from the alternator.

pumps · Posted: April 18, 2009, 6:30 am Post subject: Re: Stock Rectifier?

The bike may never warm up!

jayel · Posted: April 18, 2009, 7:45 am Post subject: Re: Stock Rectifier?

doesn't matter those Canadians don't want them to warm, melts their igloo houses/garages, and all the polar bear poop laying around

pumps · Posted: April 18, 2009, 10:04 am Post subject: Re: Stock Rectifier?

RG what is that heat sink from?

Retiredgentleman · Posted: April 18, 2009, 12:10 pm Post subject: Re: Stock Rectifier?

In Canada everything is big Rolling Eyes

Yeah jayel, this time of the year the igloo walls start to get a little soft, so I have to be sure not to let the bike idle too close to the house wall. We're used to stepping over the polar bear kaka Smile

Actually, when I built the rectifier, I looked around for what I had on hand, and I had this old heat sink from about 25 years ago. I think I had it for an audio amplifier that never got built. A little large but will keep those little electrons cool.

Yeah Pete, at absolute zero, there would be no resistance, and no voltage drops in the electrical system. Ummmm..........Canadian winters are cold, but not that cold.

gus99 · Posted: April 19, 2009, 11:01 am Post subject: Re: Stock Rectifier?

I got my heat sink in a grab bag at my local electronics store. 10 bucks for two of these plus loads of other stuff. Some say bigger isn't always better, but I think I could power some handwarmers with this setup.

gus99 · Posted: April 19, 2009, 11:06 am Post subject: Re: Stock Rectifier?

Here's the pic

yamaman · Posted: April 19, 2009, 11:12 am Post subject: Re: Stock Rectifier?

Jeez RG, yours is tiny! Laughing

pumps · Posted: April 19, 2009, 11:45 am Post subject: Re: Stock Rectifier?

Heat sink envy? Somewhere I think I have a heat sink off a computer processor that I will try to mod for mine when the time comes.

Retiredgentleman · Posted: April 19, 2009, 12:39 pm Post subject: Re: Stock Rectifier?

gus99;
That's a great job on the rectifier. Your heat sink is really cool (pun intended).

Thanks yamaman, for pointing out how trivial my heat sink now appears. Us men have fragile egos Laughing

weekendrider · Posted: April 19, 2009, 1:23 pm Post subject: Re: Stock Rectifier?

RG if you painted it black would it look bigger?

pumps · Posted: April 19, 2009, 1:41 pm Post subject: Re: Stock Rectifier?

RG -Are those connectors on there the old one spliced in or a new harness plug you bought that will plug into the stock harness?

Retiredgentleman · Posted: April 19, 2009, 3:01 pm Post subject: Re: Stock Rectifier?

pumps;
I used new 6 pin connectors on both the harness and the rectifier, because they were looking worn and beat-up. They are from mikesxs (canadian division).

xsjohn · Posted: April 19, 2009, 4:43 pm Post subject: Re: Stock Rectifier?

You guys never cease to amaze me.....sure can't hurt to keep the rectifier cool ....but it's really the engine that runs too hot......not mine though......you don't put things in the oven that you want to keep....... Idea

xsjohn

Retiredgentleman · Posted: April 19, 2009, 10:36 pm Post subject: Re: Stock Rectifier?

John; don't underestimate the bragging rights for having the coolest rectifier in town Cool

xsjohn · Posted: April 19, 2009, 10:40 pm Post subject: Re: Stock Rectifier?

Probably could lay your wanker on it in cold weather if the going gets tough..... Laughing

Like they told me about my engine.......getting it running so cool it's gonna freeze up...... Shocked

xsjohn

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