Harley Tachometer Jumping Around, Erratic Tach, Fix it.
If your tachometer is jumping around or the needle on your tachometer is erratic you fit want to check your wires to the tachometer, check your coil and check your spark plug wires. There are 5 wires going to the Harley tachometer. One pair of wires, an orange wire (power) and a black wire (ground) are only for the indicator light on the tachometer. There are only 3 wires that actually operate the tachometer, an orange wire for 12 volt power, a black wire to ground and a pink wire that triggers from the coil. The most obvious place to check is the ground wire from the tach where it's attached to the triple trees since that area is always exposed to the weather. You can also bypass that ground and just to test the tach. Next check for 12 volts power on the orange wire where it feeds into the tach. If the ground and power wire checks out then check for a break in continuity on the Pink wire which is the trigger from the coil. Clean all the connections at the coil and use some dielectric grease to prevent future corrosion on the connections on the coil. Then check the coil itself to see if the coil is bad. With all the wires removed from the coil put an ohm meter between the primary posts. The reading should be should between about 2.5 to 3.1 ohm. Then check the secondary posts, which is where the spark plug wires go. There should be about 10k (10,000) to 12.5K (12,500) ohms between those 2 posts. Check your ignition wires. It would be better to check the ignition wires at night because it wound be easy to see arching at night. If all these items check out good it's extremely likely the tachometer is bad, especially if the bike ir running good. If the bike is running poorly and the tachometer it jumping around and you already checked everything I already mentioned, it could be a problem with the electronic ignition or pickup. But if the bike it running good and everything else I stated before checks out good then 99% chance the tachometer itself is bad.
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