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  #21  
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I certainly wouldn't of thought of it until. Frankly I missed it on my first overview of the schematics.
If anybody has a pic of how it is attached, I'd like to include it also to help bring out attention to it.
Sometimes pics hit home when words run together.

Rubbers under bars the reason for it?
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That and not wanting to run the earth current back through the steering bearings. I've seen bearings spark eroded on bikes before. Notably early Jap stuff!
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Now that makes sense. Friction from the bearings.
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not so much friction but the balls or rollers covered with grease make for a poor electrical connection causing arcing which damages them making them out of round.this is a common problem when someone welds on something and doesn't have the ground at the weld area and the current passes through the bearings to get to ground.i first learned about this in the crane repair industry.
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Quote:
Originally Posted by Hippysmack View Post
... Rubbers under bars the reason for it?
Yes
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Quote:
Originally Posted by brucstoudt View Post
not so much friction but the balls or rollers covered with grease make for a poor electrical connection causing arcing which damages them making them out of round.this is a common problem when someone welds on something and doesn't have the ground at the weld area and the current passes through the bearings to get to ground.i first learned about this in the crane repair industry.
Thanks for that explanation.
So the wire on the bars is to improve bearing wear. ..or slow the degradation thereof.
And thanks IronMick.

I was wondering what the purpose was for the handlebar ground.

Oh,
What do models that weren't fitted with a fuse or circuit breaker do for load protection?
Is this something that should be or is generally retrofitted?
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ReExamined - I see the ground wire goes to the triple tree and not to the frame - the power still runs thru the bearings...

The ground wire on the handlebar is to handle the electronics of the handlebar switches -
[strike]but not thru the bearing - but rather with a direct handlebar to frame wire connection[/strike]

I suspect the grounding wire hooks up like the early EVO grounding:
http://sportsterpedia.com/doku.php/t...ng_is_critical

(See Item#23 here: https://partsfinder.onlinemicrofiche...0MISCELLANEOUS)
70191-73A WIRE, HANDLEBAR GROUND
(Edit - Corrected Link Above)

Edit: The front turn signals were mounted on the handlebars - and were grounded thru them. The turn signal switches
actually carried the full load of both bulbs thru them as the switches were in series with the bulbs (2amps per bulb).
[strike]the misadventure of shorting one of those to the handlebar would send 4amps (or more) thru the bearings without the ground wire[/strike]...

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Ok.
That clears up the function of the handlebar ground wire.
That link goes to the "Handlebar w/ Throttle Control" page at Ronnie's.
You have to go to the left menu and click on "Electrical- Wiring and Miscellaneous" to get to the page showing the handlebar ground wire.
Copying that link sends you back to the handlebar page.
Or here is a pic from JWBoon:


I was going through Hopper's wiring damage thread where he said the 30 amp breaker was a L77 addition.
Sure enough, the 30 amp (main) breaker (74599-77) doesn't show up in the 77 supplement catalog although it is in the 78 FSM as being installed on 77 models.
It doesn't show up for parts order until the 78 supplement (October 1977 ( 78 year model season)).
And even then it shows up for 78 to * - XLH, XLCH (not 77).
-78B shows it for 78 models.
So E77 models should have come with the fuse wire.
The only reference I have thus far to a main circuit breaker being installed on a 77 Sportster at all is the -78 FSM wiring diagram.
Can anybody confirm when the 77 models got the circuit breaker, if indeed they did at all?
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Quote:
Originally Posted by Hippysmack View Post
Now that makes sense. Friction from the bearings.
No, electicity sparking across the ball contact points. Metal transfers from the -ve side to the +ve side and wrecks the bearing. Like arc welding.
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Thanks for that explanation.
Electricals have never been my strong points. But I'm learning thanks to this forum.
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