Are these normal voltages while riding?
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Thread: Are these normal voltages while riding?

  1. #1
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    Are these normal voltages while riding?

    I finally got my voltmeter working again today and wanted to test another thing that I had repaired. I had worn my 10 yr old battery down flipping the bike on while not starting it during trouble shooting and it was at about 77% charge per my smart charger. I didn't wait for it to charge fully but took a ride and while on the highway at 83 mph my voltage slowly dropped to 11.8 volts. When I slowed down to 50 the volts went back up to 12.8. Nearing my friends house and going 30 it went up to 13.5.
    On the way home I was doing 85 and it went down to 11.8 again. Thought it might have something with the cruise control so I shut it off. That made no difference. Slowed to 70 mph and voltage went up to 12.4. Slowed to 60 and volts went up to 13.3. Went 50 in a gear where revs were 4000 like at 80 but volts didn't really lower. Got home and sitting in the drive way I revved the engine to 4000 a couple of times and volts went to 14.2.
    Turned it off and put the smart charger on it to see the percentage to see if the battery was charged up by my charging system. In 65 miles it had gone from 77% to 90%. I am not running any auxiliary lights or aftermarket bulbs. I have a power source that was switched off and the cruise made no difference whether it was on or off.
    I do plan on getting a new battery too.
    Normal? Thought volts should go up the higher the revs.

    Sent from my SM-N960U using Tapatalk
    Helibars, Corbin Seat, MRA Vario Screen, Cortech Tank Bag, Adaptiv mount & Escort Max detector, Amsoil Oil&Filter, Fender Ext, DanMoto Slip Ons, GIVI E41 panniers & Maxia V56 Trunk, Daugherty Adjustable Forks and Shock, Silent Sprockets-Ognibene/Gold DID Chain, Cameleon Plus Chain Oiler, Beestoy CC, Voltmeter.

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    Re: Are these normal voltages while riding?

    Do you trust your voltmeter to the tenth of a volt?

    What regulator are you running?

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    Sounds fishy. Voltage should stay in the 14 range at speed. Where is your volt meter +ve connected?
    No good deed goes unpunished!

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    BUT. i recently had an odd experience similar in some way to this. I found voltage was dropping off at high revs. I ended up connecting the output of the RR directly to the battery because i figured that something in the loom was causing the problem. Hasn't glitched since. You might want to consider that ... it's easy to do and cheaper than a new battery.
    Roboman likes this.
    No good deed goes unpunished!

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    Re: Are these normal voltages while riding?

    Agree, sounds fishy. First off I would check the voltmeter itself. I just changed my 2 year old cheap ebay voltmeter for a new one ($8 delivered) because it was showing symptoms as above. All good now.
    Roboman likes this.

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    Re: Are these normal voltages while riding?

    Quote Originally Posted by fizzy View Post
    Agree, sounds fishy. First off I would check the voltmeter itself. I just changed my 2 year old cheap ebay voltmeter for a new one ($8 delivered) because it was showing symptoms as above. All good now.
    It is a cheap Ebay voltmeter. I also have it connected to keyed power going to the fan relay. It is mounted on the left black fill panel just to the left of the tank. I also found out that when in town going slowly or sitting at a light it heats up and quits working. As soon as I take off from the light and air flows by to cool it, it starts working again.

    Sent from my SM-N960U using Tapatalk
    Helibars, Corbin Seat, MRA Vario Screen, Cortech Tank Bag, Adaptiv mount & Escort Max detector, Amsoil Oil&Filter, Fender Ext, DanMoto Slip Ons, GIVI E41 panniers & Maxia V56 Trunk, Daugherty Adjustable Forks and Shock, Silent Sprockets-Ognibene/Gold DID Chain, Cameleon Plus Chain Oiler, Beestoy CC, Voltmeter.

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    Re: Are these normal voltages while riding?

    Quote Originally Posted by leighb View Post
    BUT. i recently had an odd experience similar in some way to this. I found voltage was dropping off at high revs. I ended up connecting the output of the RR directly to the battery because i figured that something in the loom was causing the problem. Hasn't glitched since. You might want to consider that ... it's easy to do and cheaper than a new battery.
    Easy? How so? I am not real good with that. Someone points me in the right direction and I can go do it. Just snipped and soldered in 4 wires as I put in new divider on the cruise control. But Beestoy pointed me in the right direction!

    Sent from my SM-N960U using Tapatalk
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    Re: Are these normal voltages while riding?

    Quote Originally Posted by iXXion View Post
    Do you trust your voltmeter to the tenth of a volt?

    What regulator are you running?
    Stock, 2001

    Sent from my SM-N960U using Tapatalk
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    Re: Are these normal voltages while riding?

    I had a simaler problem the auto reset circuit breaker on the positive lead from the RR to the battery had slightly lose nuts causing high resistance and heat slow down it cools off and then closes and charges again.

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    Re: Are these normal voltages while riding?

    Quote Originally Posted by XXGUY View Post
    It is a cheap Ebay voltmeter. I also have it connected to keyed power going to the fan relay. It is mounted on the left black fill panel just to the left of the tank. I also found out that when in town going slowly or sitting at a light it heats up and quits working. As soon as I take off from the light and air flows by to cool it, it starts working again.
    You have a known problem with a measuring device. You have no symptoms of a problem with your bike other than the questionable information from the measuring device. Don't look for trouble.

    If the voltmeter stops working as it heats up, resistance is increasing through its circuitry and will give erroneous readings. Worse case, clamp your VOM on the battery and go for a ride. That should give you a better picture of the situation.
    XXGUY likes this.

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    Re: Are these normal voltages while riding?

    Use a multimeter at home and compare to volt meter step 1
    I reckon.
    XXGUY and Krisbiker2 like this.

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    Re: Are these normal voltages while riding?

    Quote Originally Posted by iXXion View Post
    You have a known problem with a measuring device. You have no symptoms of a problem with your bike other than the questionable information from the measuring device. Don't look for trouble.

    If the voltmeter stops working as it heats up, resistance is increasing through its circuitry and will give erroneous readings. Worse case, clamp your VOM on the battery and go for a ride. That should give you a better picture of the situation.
    The best solution. Find a quality multimeter, mount it on handlebar with plastic rubber, clamp its poles directly to the battery and drive the bike and check the voltage. I had the same situation with my blakbird and varadero. İn blackbird it was the nearly burned RR connection, and in varadero it was a malfunction, cheap ebay voltmeter. RR problems are famous in early carb birds.
    XXGUY likes this.

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    Re: Are these normal voltages while riding?

    XX
    I'd do what bull suggested. Always best to take a second reading with a reliable DVM. Then go from there. I'm suspecting the Ebay meter is bad.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  16. #14
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    Re: Are these normal voltages while riding?

    Quote Originally Posted by beestoys View Post
    XX
    I'd do what bull suggested. Always best to take a second reading with a reliable DVM. Then go from there. I'm suspecting the Ebay meter is bad.
    So do I after it heated up and quit working then cooled down and started workingagain. Do you have a link to the one you put in the upper left part of your dash? I loved how that looked sitting there.

    Sent from my SM-N960U using Tapatalk
    Helibars, Corbin Seat, MRA Vario Screen, Cortech Tank Bag, Adaptiv mount & Escort Max detector, Amsoil Oil&Filter, Fender Ext, DanMoto Slip Ons, GIVI E41 panniers & Maxia V56 Trunk, Daugherty Adjustable Forks and Shock, Silent Sprockets-Ognibene/Gold DID Chain, Cameleon Plus Chain Oiler, Beestoy CC, Voltmeter.

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    Re: Are these normal voltages while riding?

    Man
    It's been so long since I picked those up. I'll have to see what I can find. I bought 3 of them originally for each of our BB here. I can't find the other 2 right now I'll do some searching when I get back and see what i can find out. I bought them off of Ebay. They were a 3 wire DC miniature meter in green.
    XXGUY likes this.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.


 
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