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802a Burned Wiring at J7/P7

Toolslinger

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Ok... Well this came to light here:
No Start - Oil Pressure - 802a

I thought I'd start a fresh thread with a more useful title to keep the further info in.
I haven't gone any further yet really. I expect it may be a slow evolution.

I found someone with a 803a enclosure that had the engine, and generator removed, due to water intrusion/locked up condition. I will probably take a look at that this week. I could see the control box wiring in the photos, and that looked fine, and it might represent some spares of other components as well. I know there's a bit of difference between 802a and 803a, but I believe the harness that I'm looking at would work, even if I had to make the odd change.
I also got an offer from someone here for some of this.

So, I expect I'll be able to come up with parts. I haven't posted a wanted yet, because quite honestly, I don't know fully what I need. I did look in the -24P, but unless I missed it, there's no PN for these harnesses complete. It seems to just tell you what the end connections are, and you build it from the specified wire gauge.

Haven't gotten the machine indoors yet. My tractor that can run a fork is tied up with a firewood trailer currently. I can sling it from a loader, but I haven't really cleared a space in the barn to set it yet. Between social schedule, work, and weather it just hasn't worked out yet. Today, I've got howling wind (~30 mph gusts), which is when we tend to loose power, but I sure don't want to be under the trees messing with it today. I got the old gas fired unit in place in case, but that's the extent of my outdoor time today. Since all the ash trees are dead/dying, any day like today is when you just hear trees crashing down in the woods. Not good outdoor weather unless you're in the middle of a field. No ash over the house, but still not ideal to be out there.

I did pull P7 apart. Unfortunately it does have enough damage that I'll have to deal with that as well. A couple pins from J7 came out when I pulled it.

2024-10-14 12.46.46.jpg

2024-10-14 12.47.08.jpg
 

Guyfang

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NSN: 6150-01-379-0592 30554
Part Number: 88-20256
Nomenclature: WIRING HARNESS, BRAN 60HZ

The MEP-803A Wire Harness will work perfectly. Its just that the wires that go to the engine portion will be longer that the MEP-802A. So cut em off, or coil them.

Do not just look at the pictures. Look at the parts callout too. 🙂
 

Toolslinger

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And there it is... At least that shows me how they've indicated it on the schematic. Now I have the engine side number as well. If I'm lucky, the engine side is still present too.

I still intend to spend time with a meter seeing if I can find anything that caused this. It would be nice to get the replacement harnesses on hand since that may be a bottleneck if I find the time to work on the machine sooner than expected. I expect I could remake everything by hand, but that is likely to be far more expensive, and way more time.
 

Toolslinger

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The shell I ran across is from an 813a, rather than an 803a...
-24P indicates no difference for the engine side harness, so if that's present, it would be ok.
-24P indicates a different PN between the 803a, and 813a in the control box. Looking at the schematics, and parts breakouts, the only thing I see different in the harness is the 3 wires associated with the convienience outlet. I know there are component differences like relays, and switches, but the wire harness looks the same apart from those 3. If that's the only difference, I can run those seperate, and just bundle to the main trunk.

Have I missed something glaringly different? While I have been staring at this for a couple hours, I fully expect I may have missed something.
 

Guyfang

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I made a quick scan. I think, I would go for it. I too, did not see any big difference. But you need to know what started your set to burn. If its something you overlook, than you will get to see a second one smoke test.
 

Toolslinger

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Test everything I can first is the plan.
Then I'll put in the harness, and test some more before it sees batteries.
I should add that I'll be running through contact cleaner as well.
That many wires is daunting, I don't want to ever do it again.

The shell came home with me. Control box looks ok. Engine side was cut sadly. There's enough left that I can splice on my existing, but that's not ideal. No harm since mine is shot anyway, and I only have to splice 1 of 3 plugs. Gauges look ok. Switches look and feel ok. Relays are present. So the parts that cross over will likely go in the spares stash if they test ok. The shell will get sold. The sheet metal and doors look to be in good shape.
 
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