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Posted

^^^^^ I've seen the tach act up with a bad battery, too. 

You can check the alternator output on the two yellow wires. It should be roughly 45-60 VAC. If so, and it isn't charging the battery, it'll most likely be the regulator. That is the most common failure.. caused by not adding a secondary ground from the regulator case to an engine case bolt.

Posted

Any time the tach stops working chances are the bikes not charging either because they both share the headlight relay for a supply.

 

 

Sent from my shoe phone!

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