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Thread: mep 004a no fault lights working plus more

  1. #21
    General KLChurch's Avatar
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    Sorry but I'm not used to some of the slang descriptions. For example on my H1 hummer there is a primary fuel tank and an auxiliary. Not a day tank and auxiliary.
    Kris
    Murphy is my friend

  2. #22
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    So there are two tanks? One a day tank and the other that consumes 15 gallons?
    I will look at the pdf that you are pointing to.
    Kris
    Murphy is my friend

  3. #23
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    Found the day tank. Tapped on it and it seems to be almost empty.
    Kris
    Murphy is my friend

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    Checked voltage to the upper pump. easier to get to wire. No voltage with run and battle on. The battle light came on when energized.
    Kris
    Murphy is my friend

  5. #25
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    What I mean about energized is when I flipped the battle switch the light came on.
    Kris
    Murphy is my friend

  6. #26
    4 Star General Guyfang's Avatar
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    OK. The next step is to see why we have no voltage on the B2 and B3 wires. Those wires run back up to the Special relay box. The SP relay box is the box inside the rear right door, with about a hundred canon plugs on it. You need to see if all the plugs are on straight, and tight. If all the plugs are on tight and straight, then we need to pull that box out. Open it up, and see if the A5 card is there, (its marked on the wall where its mounted). Then we need to see if the three relays are attached to the card. Look at the front and back of the card for burn marks.

    To check that the wires from the SP relay box, to the B2 and B3 are good, find P5, (the canon plug is marked on the top of the SP relay box as J5) The cable that fits this plug, is P5. You can use a multimeter to check from P5, pin F and R, to the plugs that go to the B2 and B3 fuel pumps.

    The wires come into the SP relay box on J5, pins F and R, and then go to TB102-18, where they join together. You can check this with a multimeter.

    From TB102-18, a wire goes to the A5 card card. The A5 is screwed to the wall in the SP relay box. Termial 24 is where the wire goes from TB102-18. You can check that with a meter. Disconnect the wire from terminals 24 and 21. There is a diode in between these terminals. To check a diode with a meter use the diode test circuit, or set the meter for ohms. You should get continuity one direction, reverse the leads, and get nothing in the other.

    Lets see what you get. Oh, I have been calling the start switch the S1. Its not. Its S2. The old sets are different.

  7. #27
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    OK will do. This is going to take me a while so There is a chance I wont be able to report back until tomorrow. Just received the power supply and will be testing the fault indicator to see if the lights turn on.
    Will report back on that also.
    You have been a lot of help. Its too bad our time differences are so different.
    Kris
    Murphy is my friend

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  9. #28
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    Gutfang,
    Update:

    Tested the fault indicator and two lights were burned out. Switched the bulbs to prove it. The low oil pressure and over volt lights were burned out.
    Need to know were I can get replacements. Anyway I will be reinstalling the unit. Now the low oil pressure light will be working. Also when I put the switch in the run position the low oil pressure light should turn on.
    Will be doing the tasks you instructed me to do.
    Back to the manuals LOL
    Thanks for your help. I'm learning a lot.
    Report back when I get the results
    Kris
    Murphy is my friend

  10. #29
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    Installed the fault indicator module and toggled the run switch and the low oil pressure light did not come on. This is not good.
    Tomorrow I will be working on the Special relay box.
    Kris
    Murphy is my friend

  11. #30
    4 Star General Guyfang's Avatar
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    When I get home I will find the info on light bulbs. Won't be long, you will be a good generator repairman!

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