I really wish vehicle manufacturers would clean up the wiring, termination points and hose routing in their vehicles. The 'Rat's Nest' that's often created leads to problems when it comes to troubleshooting. In the mining industry, since the loaders, trucks and drills were often hand made, we issued a specification for how the wiring and hydraulic hoses were to be routed, finalized and made. No hoses or wires were to cross open compartments but run around perimeters, clamped every foot or so. Electrical wires and hydraulic hoses weren't allowed in the same bundles or together in dash compartments to prevent chaffing/fires. Wires from the main dash terminal strip ran in multi conductor, fireproof cables (not individual wires) to terminal boxes at the ends of the machine to numbered terminal strips in sealed boxes. From here they fed the proper component through waterproof strain reliefs. Very easy to trace/troubleshoot. No need to punch holes in wires. All wires had circular numbered collars which were held in place with clear heat shrink for identification (we didn't rely on colour). We were willing to pay a premium for this specialized work. Hydraulic and electrical prints were done in ladder logic to make tracing circuits easier compared to the wiring prints we typically see (like Triumph's).
And then I look at the compartment above the engine on our Rockets and other vehicles and I cringe. How many fellows have been fooled because they inadvertently plugged something incorrectly due to this organized confusion???? Sorry for the rant but this has been a pet peeve of mine for years.