Hey there, skoolie family! Just as a preface, this is NOT an "I cut X and now my bus won't start" thread. Lol! I just wanna learn some more about my bus's wiring so I can avoid becoming a cautionary tale.
2002 Chevy 6.5L Turbo Diesel Bluebird Microbus
Following the wisdom of several members here, I made sure to label both ends of each wire before removing it, writing down exactly what order I unplugged each wire, then test to make sure the bus starts after unplugging each accessory from the electric panel. So far, it's been working great, I have only unplugged two things that made the bus stop working and was able to immediately identify the problem thanks to that system. 10/10 would recommend to anyone removing wires lol
As for my questions, I mainly just want to make sure I understand what I'm looking at on the things that I can't unplug. Sorry for the wall of text and pictures! Please spare some patience for me if these are silly questions, I'm definitely learning as I go!
1) Vandalock system: The very rear door had a vandalock system wired to the sliding bolt lock and the handle lock. Here's a picture of it before I unplugged it all:
Unplugging everything went fine! Except for that pink wire. I unplugged it from the rear door lock, and traced it back to this relay:
The red* and purple wire go to the start motor relay. I found that unplugging the relay keeps the bus from starting, plugged it back in, bus runs. So, my question is -- am I correct in assuming it's okay to just leave that pink wire? It won't harm the circuit for the starter motor, even if it isn't attached to anything on the other end, right? My understanding based on the schematic I have is that it's just the accessory that would trigger the relay and keep the bus from starting.
Here's a pic of the diagram I have for it, sorry its crummy quality, I can try to upload a better version if need be:
2) master switch solenoid:
That solenoid is attached to the switch on the driver's control panel that used to operate the stop sign and warning lights. The two yellow wires are connected to the switch itself, the pink one is the ground, and the black ones are spliced and connected to a fuse box in the electrical panel, pictured here:
If I unplug that wire, the bus still starts, BUT it hesitates for a moment. Rather than starting to crank immediately, it pauses, then there is a click
sound, then it starts to crank. To be safe, I plugged that wire back in but the bus sometimes still hesitates before it cranks. *Edit: it doesn't do this every time I try to crank, though, so I'm wondering now if the pause before cranking is an unrelated issue...*
Sooo..what is that solenoid about? It seems to be what I thought a starter solenoid looks like? But its inside the bus and not on the starter? Why does it affect the ignition? And should I try to remove it or just leave it be? I really want to remove the big black box that the drivers controls are in, but if it's best not to mess with it, I'll live. With the bus still hesitating to start, despite me plugging the culprit back in, I'm pretty nervous about it. Something I noticed too is that the battery light comes on now when I go to crank the bus. Is it possible I have simply drained the battery from all the stopping and starting? Battery guage is still reading right above 14V, which is normal for my bus.
I also found two wires going to this thing:
The blue and black wires were already cut. Does anyone know what it is? One of the wires leading to it is spliced into a wire already unhooked, the other one goes to this terminal strip, the left prong of what I labeled 2:
Can/should I unplug that? Its counterpart (attached to the adjacent prong), goes under the bus, but I haven't had a chance to track it down.
Thanks so much in advance to anyone who read all of that and can give me some answers! If there is anymore info you need to answer these questions, just let me know! I've already learned so much from this community and I'm excited to learn more.