I'm sure some of you already know about this, but I did a search online to find out if someone could calibrate a volt meter in a ultra classic. I even called the dealer and they said no, this is not true! I bought a new volt gauge for my 06 ultra and it was reading 15.5 volts but it only had 13.7 going into the gauge, that's when I called Harley and did my online search. ( nothing). Noticed an adjustable diode or something like a diode just inside a hole on the side of the gauge. Using my old gauge I plugged it into the bike , fired it up and turned the screw. The needle will move higher or lower depending on the direction you turn the screw. So there you go, if you voltage is not reading right, just slightly turn the screw inside the hole on the side of the gauge and set it to what you are reading on your meter. Hope this helps someone as it saved me from making another trip to Harley.

 

Wrong forum for this subject.
Try posting this on the Touring or electrical forum.

 

Thanks for posting that info. The reason for this forum is clearly stated in the first four words of your last sentence.

 

Yes but how did you calibrate the gauge used for the calibration???

 

All my measuring equipment has a clear path traceable to N.I.S.T. from an A2LA accredited lab. Everything gets calibrated using this method on a regular basis.

What you have is two gauges that read different values. So you can calibrate it, but you need to know when it's correct.

 

Good information. But:
- I'd use a DMM
- I'd measure the voltage at the battery. That's what you reall care about. Then adjust the guard accordingly, and that way the guage will reflect the battery voltage.

Next time I have the fairing font off, I'll do mine.

Thanks for the tip!

 

I know the volt gauge on my bike is not accurate, and I don't care. It does tell me if something is going wrong though by reading higher or lower than normal. I ride my bike for enjoyment. I don't need precision gauges.

 

Nice information, I'll just use my DMM to adjust the pot. on the gauge when I have the outer fairing off.

 

Sorry, not sure how to get to that section of the forum. I'm new to this forum, and there is so much stuff crammed on the home page it kind of hard to figure out. Just not what I'm used to.

 

I just checked the wires going into the gauge with a multi-meter and that's what I set the gauge to. Takes a really tiny screwdriver to adjust the gauge.