Oops, I cut a blue wire leading to the back
In the course of removing my ceiling, I slightly nicked the conduit containing the wires leading to the back with the zip wheel on my angle grinder; on inspecting I saw I took a bit of insulation off a few wires but completely severed a blue one. Yesterday I drove my bus to the mechanic (he'll have it for awhile so I can't just check this myself) and on the way there I realized my right turn signal was not working (or else it was working but the indicator light for it in the cab was not working) although the left signal was.
Does anybody know if that blue wire is the right turn signal wire? More generally, is there a reference manual or something online for my bus that I can look at to try and figure out what wires go where? I can see this being relevant for more important things than the turn signal.