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I do see that A4-9 has arc'd at some point. Took another picture of the back. May allow you to see it a little better than the picture in post 18. As mentioned earlier, somebody had touched up the back for one reason or another. I re-streaked it with my soldering iron as you suggested...

There is a picture of A4 in post 18. If you need a close up of a certain spot, I can certainly take it off and get another picture. I found a picture of another A4 on a vendor's page and it appears to be the same design.

This will be handy. I'd only found Figure 5-27 on pages 173-176 of -34 so far. Thank you

I don't think any of the big cannon plugs were cut off. The plugs that have been reworked for some reason are for the oil pressure and water temperature safety switches. I've checked the wire labels and make sure they match the A,B,C,D of the plugs. Checking those for continuity and VDC...

Various wires have been repaired. So far, those that I have checked have been good for continuity. Some known issues I've found along the way, prior to really digging into this recently, is that S1 ,ether kit, doesn't function. I have found continuity all the way through. I also know that...

I rechecked TB101-9 and this time was able to get 24VDC....must have not had a good ground or couldn't count correctly earlier.... Tracing voltage from A5-4 to P53A at the Oil Pressure switch I have 24VDC. If my thought process is correct....the engine is not running and not producing oil...

Let's see if I can do this without much confusion. S2 - off position -- 24VDC at S2-2, 5, and 11 S2 - on position -- 24VDC at S2-2, 5, 11, and 3 (have 24VDC at S2-6 when S7 is on) S2 - start position -- 24VDC at S2- 2, 5, 11, as well as 3, 6, and 12 (no 24VDC at S2-12 when S7...

Correct, the A4 and relays worked when testing out of the set. No 24 VDC at A4-2 with S2 at Run. No 24 VDC at A4-2 when S7 is on. And no 24 VDC at TB1-3 or TB1-4 with S7 set to run the pumps. The panel lights do work.

Testing A4 and relays as spelled out, they work, but still not able to get fuel pumps or starter to engage. Checked out CB1 as well and it's working as it should. Thanks for setting me straight on the plug/receptacle (arrows). I should have easily grasped that seeing the plug ID there as well.

Still stuck on the A4 issue. I reheated the solder and smoothed it up some and rechecked continuity on the back of A4...still have it. No change on the front side with continuity between A4-7 and A4-9 or change in voltage to A4-9. Pulled the relay out of the fault indicator box, appears to...

I removed the wire from the A4-7 screw and checked for continuity between the A4-7 and A4-9 screws. No continuity this time. I checked the 'silver' soldered area on the backside of the A4. Holding my leads on each end of the solder 'streak' the repair job does check out for continuity...

A4 doesn't appear burnt, but it does look like somebody has tried to solve an issue before. Or at least I suspect the silver colored solder isn't original?

Ok, I do not get 24V when checking A4-9, but I do get 24V when I check A4-7. I do have continuity between A4-9 and A4-7, between S2-3 and TB1-10, and continuity between TB1-10 and A4-7.

Sounds promising! I ran the jumper wire from A5-21 to TB101-3 and then from R13 to A4-9. Fuel pumps ran in both instances.

The fuel pumps run when connecting either 21 or 23

Yes, sorry I failed to include that in the original post when i was referencing tracing the wires and the CR27 comment. To confirm though, i followed the procedure in -12 TM which is section 3-159 that is on page 206 in my pdf file.

Still slowly working at this. I did get the P80B pin extracted and wire resoldered and it is connected to TB101-6 as it's supposed to be. I've found some weak connections in the special relay box and put new terminal ends or spliced the wire, but so far nothing to fix the issue.

Hi all. I'm a relatively new member. So far i've just read through various threads to figure out issues with our 998 Humvee and M929 6x6 and now our 006a...we get them through the Federal Excess Property Program. This is a bit windy, but hopefully it will provide you with enough information...