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Thread: MEP-004A, No output

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    battery2.jpg

    Quote Originally Posted by KLChurch View Post
    I checked the batteries while installed.
    Red on red, black on black. (Outputs to starter)
    No DC volts with the Dmm.
    What I'm I doing wrong?
    Kris

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    Quote Originally Posted by KLChurch View Post
    I checked the batteries while installed.
    Red on red, black on black. (Outputs to starter)
    No DC volts with the Dmm.
    What I'm I doing wrong?
    Kris
    Just checked the same way with my analogue meter and it says approx. 26 volts
    I guess the DMM is getting confused or its me.
    Kris
    Check to see that you have the right setting and to see if the plugs are all the way in the DMM. You can also have a bad probe/wire/plug. Don't start making problems that aint there.

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    Quote Originally Posted by peapvp View Post
    That is where I'm checking it.
    My analogue is showing approx. 26 volts maybe a little higher.
    But my DMM is showing .O.L
    Kris
    Murphy is my friend

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    Guy
    I checked the DMM with a AAA battery and it said 1.559 dc volts
    Ill try disconnecting the two large wires and see if the DMM is getting confused.
    Kris
    Murphy is my friend

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    I guess I'm the confused.
    Their is an auto detected option on the tester.
    When I turned it to volts instead of muli volts the auto detect turned off.
    So I finally got a Reading 25.7 volts.
    Kris
    Murphy is my friend

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    Quote Originally Posted by Guyfang View Post
    Check to see that you have the right settings and to see if the plugs are all the way in the DMM. You can also have a bad probe/wire/plug. Don't start making problems that aint there.
    This has to be the most often made mistake in the history of mankind. I will admit to maybe........................ once or twice doing the same thing. But only when I was young and dumb.

    Its a shame you all could not see me as I finished the last sentence. I smiled and picked up my Obendorfer Edel Pils and killed it!

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    I'll raise my hand when I make a mistake and even higher on a dumb mistake.
    Kris
    Murphy is my friend

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    Quote Originally Posted by peapvp View Post
    Thanks Coug! In the end it may have been the batteries which caused the starting problems in the first place. As Coug explained, the old ones are probably toast now. So, it wasnít the S2 switch after all.
    I have one customer with a 30+ year old Generac diesel standby unit that would start just fine every time I was there to test it, but would fail to start at random other times. The company that worked on it before me charged them over $1600 to replace most of the fuel system.

    After doing a few tests to over the course of a few weeks it I ended up installing a new battery, because the on that was in it had failed down to the point where it had enough juice in it to crank and start it some of the time, especially if tested on manual settings, but in automatic and being controlled by the transfer switch it didn't.

    Sometimes just because it works when you try it doesn't actually mean it's in good enough shape to work the rest of the time.

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    Coug
    That's good to know.
    Ive been texting Peter trying to trouble shoot the gen on Volts and hertz.
    I will report the results in the morn because it will be lengthily.
    But because Coug mentioned batteries I have been starting and stopping the gen several times with the two new more powerful batteries.
    The last two times with a warm engine it cranked slower than any time than with the other batteries, also with a warm engine. And giving the time to recharge.
    Will try to start the gen again in the morn.
    This to me is illogical.
    Kris
    Murphy is my friend

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    Generators in general have much much smaller alternators then cars or trucks as they were not designed for start and stop. The general rule of thumb on MEPís with the correct battery size that they need to run for four hours after just one start to bring the charge of the batteries back to 100% and about 8 hours if the genset went through several start attempts or extreme cold weather.

    Charging two large batteries connected in series will double the needed charging time. The current displayed on the charge indicator or ampmeter is misleading because you are charging a total of 12 cells instead of 6 cells in a single battery system.

    constant trickle / float charging is your friend and a good trickle / float charger will do that without damaging the batteries.

    The most often made mistake is the constant undercharging of the genset batteries. Nothing will kill
    your batteries faster.

    the math is simple:

    each batterie has 120 amp hour capacity
    thats 120 * 2 = 240 Ah

    this means if your batteries connected in series are completely empty and you apply a charging current of 1 Amp then it will take 240 Hours to charge the batteries to 99.99%

    at 10Amps it would take 24 hours

    so take your time to charge your batteries properly

    Quote Originally Posted by KLChurch View Post
    Coug
    That's good to know.
    Ive been texting Peter trying to trouble shoot the gen on Volts and hertz.
    I will report the results in the morn because it will be lengthily.
    But because Coug mentioned batteries I have been starting and stopping the gen several times with the two new more powerful batteries.
    The last two times with a warm engine it cranked slower than any time than with the other batteries, also with a warm engine. And giving the time to recharge.
    Will try to start the gen again in the morn.
    This to me is illogical.
    Kris

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