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I am currently working on an '85 1200 limited edition. I am in the process of finding a possible short and would like to test the SILICON RECTIFIER. Where is this thing located on the bike??!! Any help would be appreciated; especially if that help comes with a picture or two.
 

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It's a combination voltage sensor, 3 scr's, and the 6 diode bridge. I don't really know of a way to test it, other then substitution. But, it's under the faux tank, about right off to the left of the trip computer. I'm trying to remember, but I think you open the trip meter, and look in there to the left. It's a square blackish heatsink, if it's oem.

What's the problem?
 

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I found these on E-bay. I aslo found something that looks just like these tied into the wire harness, under the forward edge of the seat on the left side of the bike. When I have time I'm gonna remove and test it. I also found some sites on the web that describe how to test one of these things. I've also seen info on this site that indicates if these malfunction they may set up a situation in which your battery gets drained evein when the ignition switch is off.
 

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I believe those are what most of us refer to as diodes for the starter system. The manual does call them silicone rectifiers. They have nothing to do with the charging system.
 

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Test the output to the battery with a DC voltmeter. If you get AC ripple or higher readings it could be a sign of AC passing, if voltage is to low could be an open, but in any case what are your readings? Post back and we might be able to tell with enough info.
 

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Google search "testing a gl1200 regulator". Go to the link (third one
down the list on my page) that is the google.books link. Scroll down
to page 196 and read the left column.

This is easier then me trying to type the instructions.

There are others here that might have better links.


Here is a photo of what your regulator will look like.
It is generally located on the left side of the bike near
the air cleaner area. You will have to remove the faux
tank to remove it. However, you probably can test it
without removal of the faux tank.
 

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True. With an ohm meter, all of these should read 12 volts.
Nightrider1
 
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