gmc bus owners or suggestions?

[johnjem]

The person who owned my bus last did some major wireing nightmare??s i tell u what man!! i have it preety much figured out but left side of the dash gage lights come on when eng on toggle is on right side of gages come on when i turn on the marker lights!! witch way should the gages turn on with eng on toggle or marker light on ?? i can do it ether way but i want to do it right<<

[tekebird]

marker lights is correct

[FloridaCliff]

My 4905's come on with the markers.

Cliff

[gus]

Markers, as per your wiring diagram.

I have had numerous weird wiring gremlins in my 4104 wiring and still have a couple.

[johnjem]

i think i need 2 spend atleast a week to figure this out i stop at night and then forget what i learned the day befor and i have to start all over.Now i start putting it on paper and i just got a labeling machine so i now can mark wires and to where they go i think this will help me out alot!

[brojcol]

You'd sure love a wiring diagram...

[Cary and Don]

Been there and done that.  It took three weeks of evenings and two full weekends to install our new dash.  Mostly because of some butcher.

Get the cd with the wiring diagrams.  They are a life saver.  All those wires are coded with color and differant hash marks.  Sometimes it doesn't make sense because there are relays and other things the wires run through.  Some items are operated with hot, others with ground.

I placed a tag on every wire stating it's color, hash pattern, and which post in the junction panel it came from.  Every wire for every function is differant.  Every color has a differant function.  You will not find a beige wire with two hash marks being used for more than one thing.  It might go from the junction panel to a switch and then on to a light.  But that will be it's only use.

When I got done,  I made an addendum to the wiring diagram and the junction panel and breaker panel post numbering so I could remember what I did.  I had trouble remembering the next day too.

Cary
GMC4107