Richard, Im new on here so hello to you and hello to everyone else.
I have just completely rewired one of my pioneers and, as has already been mentioned, the wiring diagram is about as much use as a chocolate watch. If your still having fun with the wiring then this may help.
Top terminal posts in fuse box are NOT bridged, they need bridging with heavy copper wire.
The diagram shows the headlight earth connected to the 24v feed....ignore this wire it doesnt need it at all.
The starter and dynamo are 24v everything else should be 12v.
Fuse 1 and 2 are bridged, this is where the headlight feed comes from.
Ignore 24v on the back of the light switch, its there for the starter button, not the lights.
All earth posts in fuse box are bridged and need connecting to body or chassis.
Brake lights were not fitted
Indicators were not fitted (trafficator arm for left turn and a very log arm for right turn).
If you take a feed from either fuse 1 or 2 and connect to the unused terminal posts in the top of the fuse box, then bridge them so that there is enough lives for brake lights, indicators etc you can run all your auxillary wiring from them.
Hope this helps.
I may have repeated some facts that others have already said, but the re-wire is still fresh in my mind, so if you have any questions then please ask.
Chris
PS it really caused a headache trying to wire it up, but now its done and everything works fine.