Voltage Gauge
Road Warrior
Joined: Jun 2012
Posts: 1,672
Likes: 17
From: Orange, VA,
I know where my gauge normally reads, if it differs more then where it usually is I know something is not right, like last week it was higher then normal with my hi beam on, I checked and my hi beam was out, they are not going to read exactly right, is just a reference point, like Mike said, check it at the battery running with a volt meter to see what you are really getting.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,897
From: Bedford UK
I'm reminded of my time as a trainee engineer, when we were taught that if a warning light comes on, the only thing of which we can be certain is that the bulb works! Same applies to the voltmeter, as already suggested. If it changes, check to see what is actually going on!
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Road Warrior
Joined: Jun 2006
Posts: 1,993
Likes: 20
From: Southeast GA
It just annoys me every time I look at it being so far off.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,897
From: Bedford UK
If it is high it may be possible to get it to read closer to what it should be, by using a small resistor. May be worth experimenting..... 
Ultimate HDF Member
Joined: Jan 2013
Posts: 5,092
Likes: 2
From: Wenatchee, WA
An analog gauge is linear with respect to voltage. Usually there is a small inscription at the bottom of the gauge stating the voltage req'd to drive the needle full scale. If you feel the need, remove the existing wiring from the gauge and connect an adjustable power source (ie, pot) that will allow you to accurately adjust the driving voltage to full scale (needle) deflection. Where on the scale the needle is driven to would indicate how far out your calibration (wrt gauge) is.
Outstanding HDF Member
Joined: Aug 2008
Posts: 3,078
Likes: 6
From: Michigan
Hell, I don't think it's worth all that trouble, My old flhtc's gas gauge was off a tad, I just got used to it and fueled accordingly (wqas glad I had a reserve though)
Elite HDF Member
Joined: Sep 2007
Posts: 4,928
Likes: 69
From: Near Myrtle Beach, SC
All HD gauges are just "relative" indicators, not precision instruments. There isn't a single one of the gauges, with maybe the exception of the tach, that are accurate on most bikes.
One would think that in the year 2013, environmentally sealed accurate gauges could be manufactured for these bikes. It's all about HD profit margin. It's actually pathetic.
One would think that in the year 2013, environmentally sealed accurate gauges could be manufactured for these bikes. It's all about HD profit margin. It's actually pathetic.
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