Chuck Posted June 6, 2017 Posted June 6, 2017 ^^^^^ 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.
Kiwi_Roy Posted June 7, 2017 Posted June 7, 2017 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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