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Old 10-05-2005, 10:37 AM   #1
Dbear OP
Hanging on
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Joined: Jan 2005
Location: 900 feet above Route 100
Oddometer: 14,854
Need R100GSPD Electrical Help

Here's the deal - was out riding the last couple of days and all of the sudden I start getting wildly fluctuating readings on my tach. All of the sudden it would drop my 200 RPM.

Then, Yesterday, the starter begins having a hard time turning over the engine.


Diode Board?


Loose nut behind the bars?

Just an idea where to start would be helpful

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Old 10-05-2005, 10:40 AM   #2
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Location: Toronto, ON
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You're better off here:

Probably the diode board..
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Old 10-05-2005, 10:46 AM   #3
Rubber Cow
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Joined: Jul 2001
Location: Aloha... yes, Aloha, Oregon
Oddometer: 5,336
Here we go!
Contact Motorrad Elektrik and buy their Airhead electrical manual/flyer and then do a search for airhead electrical in the Old School Rides forum here and also look at the website. There is a lot of information on similar problems in both places.
Does the red charging light come on when you switch the ignition on BEFORE you hit the starter motor?
Have you check all of the fuses lately?
Have you had the front cover off recently?
Has the bike gotten wet lately?
Now that the weather's changing you might want to yank the battery connections and ground to the transmission and power line to the starter motor and grease them with dielectric compound or silicone grease.

It takes some time to sleuth but these bikes are well know and pretty simple when it comes down to patient, you'll figure it out!

"He had that rare weird electricity about him--that extremely wild and heavy presence that you only see in a person who has abandoned all hope of ever behaving"normally"."

"Woof, woof woof woof ...woof woof!!!!!!!!!"
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Old 10-05-2005, 10:51 AM   #4
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Location: Toronto, ON
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PM me your email address and I will send you a PDF file written by Dr. Gregory Frazier, author of GSing around the World and other books, who has written a comprehensive article on the airhead GS's and with a list of aftermarket resources that are cheaper and better than OEM.
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Old 10-05-2005, 03:53 PM   #5
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Location: Burlingtron,VT
Oddometer: 14,004
Hey Bear, I'll be glad to help you install that 450w kit if you decide to go that way.
Just say'IN
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Old 10-05-2005, 04:01 PM   #6
Frank Warner
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Joined: Mar 2002
Location: Sydney, Australia
Oddometer: 6,593
Originally Posted by Dbear
Just an idea where to start would be helpful
Question 1. Do BOTH red lights (oil and battery) lights come on before you start the bike? (Key on - kill switch on - engine not turning over)

If the battery light does not come on then you should not be riding the bike. Those red lights are important - check them frequently.
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Old 10-05-2005, 04:06 PM   #7
Beastly Adventurer
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Location: N.E. Ohio
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PM sent

PM sent
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Old 10-05-2005, 05:18 PM   #8
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Joined: May 2003
Oddometer: 425
I lost my tach and taillight due to a short from a frayed wire passing through the airbox area. I didn't find and fix it (mechanic did) but it was that simple. Didn't have starting problems but its something to think about.

And now for the details........probably a mouse chewed through it because there was also a mouse nest in the airbox.

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