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Thread: mep 004a no fault lights working plus more

  1. #31
    4 Star General Guyfang's Avatar
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    Morning!

    The light bulbs are found in TM9-6115-464-24P, PDF reader page number 32-33. Figure 7, item 9. NSN 6240-00-155-7836, part number MS25237-327.

    There are about 25 other NSN's and Part numbers, if you look hard enough. But no need. I plugged in the NSN in the big sale site. The prices are eye openers. Then I plugged in the part number, and found 10 bulbs for 3.00 bucks. If you want the list of canceled NSN's and Part numbers I can provide it. Great stuff for a long winter night. The list of suppliers is also as long as a Texas road. Almost all, were large company's, that simply bought from OSRAM.

    I am fairly sure that the wire from the low oil pressure goes from the sender to the SP Relay box. If there is a problem in the SP relay box, it could and can affect other things.
    Last edited by Guyfang; 07-14-2019 at 05:28.

  2. #32
    Colonel KLChurch's Avatar
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    Quote Originally Posted by Guyfang View Post
    Morning!

    The light bulbs are found in TM9-6115-464-24P, PDF reader page number 32-33. Figure 7, item 9. NSN 6240-00-155-7836, part number MS25237-327.

    There are about 25 other NSN's and Part numbers, if you look hard enough. But no need. I plugged in the NSN in the big sale site. The prices are eye openers. Then I plugged in the part number, and found 10 bulbs for 3.00 bucks. If you want the list of canceled NSN's and Part numbers I can provide it. Great stuff for a long winter night. The list of suppliers is also as long as a Texas road. Almost all, were large company's, that simply bought from OSRAM.

    I am fairly sure that the wire from the low oil pressure goes from the sender to the SP Relay box. If there is a problem in the SP relay box, it could and can affect other things.
    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.
    Everything looks ok

    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.
    Haveínt done this yet need a plug diagram for the pin outs. The reseptical is not legable.

    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.
    Done this but haveínt determined if the continuity is F and R. The plug is not readable. But two pins had continuity.

    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.
    Did this and everything checks out.

    Lets see what you get. Oh, I have been calling the start switch the S1. Its not. Its S2. The old sets are different.
    Inside the special relay box looks untouched. In fact the insides looks brand new. I donít think anything is wrong with it.
    Why does the lights on the fault indicator not light up? The panel lights work. The battle light works.
    After I find the connector pin outs I will be able to troubleshoot the wires to the pumps.
    Thanks for the help
    Kris
    Murphy is my friend

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    Colonel KLChurch's Avatar
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    Gutfang
    Checked the J5 pins f and r. It seems that there is capital letters and smaller case letters.
    Example: F and f , R and r
    I got continuity what I believe is f and r pins to the TB102 Board, Number 18 slot. Even with a magnifying glass I could not read the letters. But I got continuity with two pins.
    Next I will check the wires going to the pumps.
    Everything else you suggested is fine.
    So I guess also I will reinstall the Special Relay Box
    Kris
    Murphy is my friend

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    Gutfang,
    The fault bulbs I have are the screw in type for the fault indicator. (Threaded)
    The part numbers I believe you gave me look different. Not threaded
    Kris
    Murphy is my friend

  5. #35
    4 Star General Guyfang's Avatar
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    Look at he front and back of the A5 card in the SP relay box. See if its burnt.
    Look at J5/P5. Have seen a number of times, Pin A pushed back, on J5 or P5.
    You don't need to put the bottom of the SP relay box back on, until you get it fixed. Makes it easier to turn the chassis over and make a check.

    I was going to tell you to unhook the two wires to TB102-18, and then hook up J5 to P5. Then unhook the two wires to B2 and Br. Ohm the two wires that go to B2 and B3. Since you have unhooked them, you should get an open. Then hook the two wires back together, or have someone hold them together. Then ohm again at B2 and B3 wires. You should get continuity, if the wires are good from the fuel pumps to the TB102-18. I was just a bit slow. didn't get home as early as I planned.

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    4 Star General Guyfang's Avatar
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    Quote Originally Posted by KLChurch View Post
    Gutfang,
    The fault bulbs I have are the screw in type for the fault indicator. (Threaded)
    The part numbers I believe you gave me look different. Not threaded
    Kris
    You can pull out the bulbs from the red sockets.

  7. #37
    4 Star General Guyfang's Avatar
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    try resetting the S9 (over speed switch) switch.

    Look in the control cube. Is the A4 card burnt, front or back?
    Does the A4 card look like its been changed? Loose wires?
    Take the two relays out, and exchange them. Try and start.

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    Look at he front and back of the A5 card in the SP relay box. See if its burnt.
    Look at J5/P5. Have seen a number of times, Pin A pushed back, on J5 or P5.

    A5 card is good and no pins are pushed back I'm reporting one at a time because SS times me out
    Kris
    Murphy is my friend

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    I was going to tell you to unhook the two wires to TB102-18, and then hook up J5 to P5

    There are 4 wires at TB102-18 two on each side. witch two wires?

    Kris





    Murphy is my friend

  10. #40
    4 Star General Guyfang's Avatar
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    There are 4 wires at TB102-18 two on each side. witch two wires?


    The wires should be, P51D18 and P51B18. They then go to Terminal 24 on the A5 card, on wire number P51E18. The last wire goes to J7, on wire number P51A18.

    Also, when using wire numbers, you do not need to use the last two digits. They are the wire size. So when I next write a wire number, like P51A18, I will write it so, P51A. Makes it simpler and quicker.
    Last edited by Guyfang; 07-16-2019 at 15:17.

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