KTM 640a Voltmeter

Discussion in 'Thumpers' started by Tempo, Nov 15, 2007.

  1. Tempo

    Tempo Stumptown Native

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    I installed a voltmeter from DigitalMeter to monitor my KTM's [sucky] power output. So far it works well. :thumb

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    #1
  2. R.Markus

    R.Markus Damage Addict

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    :thumb

    That's a good clean install. I like it. I may have to get one of those myself so I don't let my Gerbing jacket kill the battery.
    #2
  3. ChrisC

    ChrisC Amal sex?

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    Looks nice... just wondering how weatherproof it is?
    #3
  4. Tempo

    Tempo Stumptown Native

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    Me thinks I'll find out today. I am riding 90-min south (to get a custom seat!) and the forecast is:

    Today: Periods of rain. High near 55. South southwest wind 17 to 20 mph decreasing to between 5 and 8 mph. Winds could gust as high as 26 mph. Chance of precipitation is 100%.

    It's still pretty dark here but I can tell that it's quite stormy right now. This could be a rough ride!
    #4
  5. disconnected

    disconnected rider

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    dangola... its 32 here with snow flurries... :nod

    very good looking install.. keep us posted..

    thanks for the link..


    greg:drums
    #5
  6. Tempo

    Tempo Stumptown Native

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    Well I rode 90 min in pissing rain this morning to Mr Eds Moto, where I am now, and the meter still works. :thumb

    Wish I could say the same about the KTM... riding down the Interstate it started acting like it was gas starved. WTF? After coasting to the shoulder it sputtered along for a mile or two then went away. Not feeling real good about the ride home.

    Back to working on my new seat...
    #6
  7. Tempo

    Tempo Stumptown Native

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    I rode +/- 4.5 hours in more or less steady rain today. Yeah the voltmeter seems OK to use in the wet stuff. :nod

    /end of thread
    #7
  8. bmwktmbill

    bmwktmbill Traveler

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    Tempo,
    Nice job.
    What circuit did you wire into?
    Were the readings more or less steady underway or were the numbers rolling up and down?
    BTW nice seat too.
    bill.
    #8
  9. Tempo

    Tempo Stumptown Native

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    Oct 25, 2005
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    Oregon
    There are two switched 12v circuits under the fairing, right? Just use one of them. You can find male Molex connectors for about $0.25 or less at a good electronics store (not Radio Shack). Crimp some wires and plug right in.

    So far I've noted that readings are pretty steady given a constant RPM. Here's some very UN-scientific data after all of 5 hours in the saddle with the voltmeter going:
    • I see 14.0v - 14.1v on avg. with no accessories running at 4k+ RPM
    • When idling it drops under 14.0v but is still is more than 13.0v
    • Sometimes idling it goes below 13v (yet above 12.0v)
    • Heated grips on low take 0.3v - 0.4v off the top
    • Heated grips on high take 0.7v
    • GPS doesn't seem to draw much, if any, maybe 0.1v (?)
    • Sorry I can't remember what the high beam draws (0.3v?)
    • Haven't tried it with the heated vest yet
    It's a worthy accessory. Tonight while I was idling in traffic (!!!) in the rain (!!!) I saw it dip below 12.0v so I shut off my grips.
    #9
  10. Seth S

    Seth S Will _____ for _____

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    The voltmeter is easy to wire in. You will get your most reliable results if you connect it directly across the battery...as in one lead to battery + and one lead to battery -. it wouldnt hurt to throw in a small amperage fuse as well...something like a 5 amp or less would suffice. The voltmeter is not a load but if one of your wires wears through and grounds out you will have a fuse to blow before the wiring burns up.
    #10
  11. on2wheels52

    on2wheels52 Long timer

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    Wouldn't a voltmeter be a (constant) load if wired direct to the battery? Or does the one pictured have a third wire to power the display?
    Minuscule power draw, no doubt.
    Jim
    #11
  12. Tempo

    Tempo Stumptown Native

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    If it was wired directly to the battery it would never turn off. :rofl
    #12
  13. Droptarotter

    Droptarotter Long timer

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    Old thread, but I ordered a $3 voltmeter off of EhBay ( I'm Canadian, you know). It was a little large to drill a hole in my dash, so I made a bracket out of some plastic I had lying around and then zip tied it to my road book holder and GPS.

    Meter works well, compared it to my multi meter. The red display is not too bright at night and seems easy enough to read in the sunlight that I exposed it to.

    This photo is not the finished product, I reshaped the plastic to make it look a little nicer.

    Cheers



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