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jason8887
 Post subject: mystery electrical part
PostPosted: Mon Oct 31, 2011 9:27 pm 

Joined: Mon Aug 01, 2011 8:24 am
Posts: 186
Location: Waterloo, IA
this part was in my original wiring harness.
Attachment:
IMG_4080-2.jpg


it was between the regulator/rectifier and the battery/fuse. I don't see any reference to it in the electrical schematic in my shop manual. Any idea what it is? Is it needed?

'72 h2


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Jason
72 h2 in a 93 Katana
03 cbr600rr
80 kz750 ltd
94 pw50
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Jim
PostPosted: Mon Oct 31, 2011 9:33 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9928
Location: North Central NC
jason8887 wrote:
this part was in my original wiring harness.
Attachment:
IMG_4080-2.jpg


it was between the regulator/rectifier and the battery/fuse. I don't see any reference to it in the electrical schematic in my shop manual. Any idea what it is? Is it needed?

'72 h2

It's a reverse current blocking diode. The early H2s needed it because the regulator would drain the battery slowly without it. Later regs behaved better and Kaw dropped the diode.

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H2RTuner
PostPosted: Mon Oct 31, 2011 10:41 pm 

Joined: Thu Jun 09, 2011 11:25 am
Posts: 3156
To add to Jim's post, they weren't factory installed on the very first H2's, they were supplied by the factory for bikes in service before a frame number that they came already factory installed on.

There may be a FDM for it in mraxl's resources.
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jason8887
PostPosted: Tue Nov 01, 2011 2:38 pm 

Joined: Mon Aug 01, 2011 8:24 am
Posts: 186
Location: Waterloo, IA
Well, that explains my mysteriously draining battery too..

Man, I must have a really old one!

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ride hard, ride long, ride safe!
Jason
72 h2 in a 93 Katana
03 cbr600rr
80 kz750 ltd
94 pw50
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Jim
PostPosted: Tue Nov 01, 2011 2:56 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9928
Location: North Central NC
jason8887 wrote:
Well, that explains my mysteriously draining battery too..

Man, I must have a really old one!

I'm pretty sure all '72 H2s had the less desirable regulator, and maybe the '73s too.

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Zambia
PostPosted: Tue Nov 01, 2011 4:17 pm 
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Joined: Wed Jun 08, 2011 10:08 pm
Posts: 1901
Location: Campbellville Ontario
Both my '72s have that thing. One very early, one very late.
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mc356ce
PostPosted: Tue Nov 01, 2011 5:03 pm 

Joined: Thu Jun 23, 2011 8:27 am
Posts: 170
Location: Danville, IL
My early '72 (6300ish) did not have it from the factory, I learned first hand why those were needed asfter a few months. It wiil discharge the battery in a few weeks. Installed the rectifier and battery never goes down.
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Jim
PostPosted: Tue Nov 01, 2011 5:19 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9928
Location: North Central NC
The service bulletin answers some questions:

Quote:
Bulletin#: 73 H-9
Date: May 17, 1972
Bike(s) affected: H2
Subject: H2 rectifier

Action taken:

An H2 not driven frequently may discharge the battery, because of a slight drain on the battery from two small resistors. A supplemental rectifier has been developed to stop this leakage. The new part, part #21061-014 must be installed on H2's through H2E-13265. H2's H2E-13266 and up have this installed from the factory. (It is installed between the red lead from the regulator and the battery.)

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