Chasing the Hapy Electrical Gremlins (part 3)

Continuing on our journey through the darkness of the wiring rat's nest.

 

Shouldn't Have Cut That

not quite "before",
dashpod already pulled

I'll just jump right into the interesting part. Well, mostly. I started in the engine compartment and removed the wiring related to the coolant heater first: the relay box, the wires down to the glow plugs, etc. That much was great. Then, I moved on to looking at some of the wiring above, and as the bold-faced line implies, I cut something I would best not have.

 

Reflect back to the last time I clowned around on this wiring, I dug deep into the fuse-box. I started by pulling the fuses for circuits Hap doesn't need. Circuit by circuit, I cut that unnecessary wiring by referencing fuse sockets where the fuses had been pulled. That plan worked great. Lots of extra wiring got removed, and the engine still ran. I still had the sporadic not-limp-mode, and the occasional Hapy-don't-wanna-start issues, but they both seemed improved. Well, this time around, I got into the fusebox and saw a few wires that did not appear to have a partner on the other side of the fuse. So, I figured I just missed them the first time, and cut them. Well, that was wrong. Their "missing partner" was actually a common-line always-hot (circuit 30 in VW-speak) that was kind of hidden from view. Well, I didn't see them anyway. The wires I cut are for powering "engine control" circuits, of course. So, kinda important. Ugh.

Fuse Box Smaller

don't actually need
any of these relays

Once I realized that the wires I cut were critical, I needed a new plan. A while back, I bought a small relay box thing off eBay that has 6 relay slots and 6 fuse sockets. Once it arrived, I looked at how many fuses were in the donor fuse box and how many sockets were in that smaller box and the math did not add up. That was all before I did the clear out I mentioned above. After that, I was down to 7 fuses, and one of them was for the OBDII plug that I don't actually use. So, I think the fuse socket numbers may work. As for the relays, I only need 2 of the donor relays: the infamous 109 (main power) and old 180 (glow plugs). All the other ones can go, which leaves me 4 slots for other things, like the "RUN" and "START" trigger relays I have connecting the ignition from the front to the electrical from the donor. Neat. I didn't mean to change the fuse box and the relay plastic holder thing, but when I cut those two engine control wires the die was cast.

Label, Label, Cut

smarter way to remove
extra wiring

So, into the darkness we go. I started with the more obvious wires, like the thin little wires on the 180 (glow plug) relay. Then, I moved on to the T10 plugs. There are 5 (Blue, White, Black, Orange and Brown) 10-pin plugs in the mix of all that rat-nest. I unplugged them, and started dissecting by labeling either side of the cut, describing what is on the other side, and cutting. This picture on the right here explains the wire coming from the ignition switch position 86s as an example of how I dealt wit the wire-snarl.

While that sounds like quick work, I have moved slowly, researching each wire first, to make sure I don't have another "engine control" mishap. And, I want to do more than just label where it went; I want to know what it does first. This is a lot like a jigsaw puzzle where the more you do, the faster it goes until you eventually have all of the wires you intend to cut labelled and cut apart. I am almost done, which means the next post on wiring should include some building back up.

Diagramming

One last thing I have been doing, is crafting my own wiring diagram. I started by scanned the wiring diagram for the early ALH engine (80-pin ECU) from the Bentley. There are 13 pages. I am examining each circuit across the diagram and editing the image of the page to reflect what my circuitry will look like. I am retaining the original circuit numbering, etc. but adding the number of the fuse that I am using in the new fuse box to the documentation. Perhaps more importantly, I am erasing the wire references to things that I no longer have, like the coolant warming glow-plug stuff. My thinking is that this way someone who knows the original wiring (looking at you, Justin) can understand the diagram just as well as I do. This diagram will replace the diagrams in the 3-ring binder, since the 2 sets in there are both for later ALH models, so they are informative, but not exactly 100% representative. Between the cold and the dark, the diagramming effort helps me feel like I am moving forward while also creating clarity around the work.

My CoViD-19 Plea

I take a 2 mile walk pretty much every day to shake off the cabin fever and to get some exercise. Every day, I see 20-30 people also out taking walks, riding bikes or taking a run as well. That's great except I can count on one hand the number of people I encounter with a mask on at all (even worn wrong). The other day, I counted 3 people out of 28. Seriously. Our tiny state is consistently seeing over 1200 new cases a day, which is alarming when you consider our "summer peak" was 430 cases a day. Please keep your masks on, its not a political statement, it's not a chin-strap and it doesn't work unless it covers your nose and mouth. It's to protect others from you, not the other way around. We don't know if you have the virus or not, and quite frankly, if you're wandering around without a mask, and hanging around with others who don't have masks, then even if you had a test today... you don't know either. Just because you're outside doesn't mean you can run/walk/bike right past other people a-huffin and a-puffin (and sometimes a-coffin) without a mask. We are all tired of this, but that doesn't change anything about the importance of respecting it, and each other --