I recently got all my clearance lights working. I then took the coach in to get the exhaust system fixed. They replaced the pipe from the twin mufflers to the back with a 3 inch pipe and fixed some faulty welds at the mufflers. It looks great now. Now when the running lights are turned on it blows the 20 amp fuse immediately. It may be coincidence. I can't think of how the two could be related unless there is a wire run down the passenger side underneath that might have gotten melted. I couldn't see anything with a quick look.

Any ideas before I try tracing the wiring?

Thanks,
Mike

What did u do to get the clearance lights working? Usually if I have an electrical problem after doing wiring I re trace my steps. There are coincidences but commonly a new problem which arises immediately after work done can be traced back to an oops during the " repair"

Todd Sullivan

Sully
77 royale
Seattle

Mike,

If you're going to break all the clearance light connections anyway, this
would be a good time to correct the wiring. 8 of the 9 clearance lights
I've converted to LED were wired with the wrong polarity -- the bases were
(+) and the center contacts (-). This is a very common discrepancy which
doesn't much matter as long as the lights are mounted on the SMC body and
use non-polarized incandescent bulbs. If you install LED's, they won't
work with reversed polarity.

Fix 'em now to eliminate frustrations later.

Ken H.

Start tracing.

But start at the trailer hitch wiring just in case a PO tied into the
tail light circuit & the muffler folks somehow shorted that.

JWID,

Ken H.

Mike,

Your steering column corrosion may or may not have been from spilled soda.
The windshield gaskets frequently leak at the top, letting water drip
right on the horn button.

Ken H.

I recently got all my clearance lights working. I then took the coach in to get the exhaust system fixed. They replaced the pipe from the twin mufflers to the back with a 3 inch pipe and fixed some faulty welds at the mufflers. It looks great now. Now when the running lights are turned on it blows the 20 amp fuse immediately. It may be coincidence. I can't think of how the two could be related unless there is a wire run down the passenger side underneath that might have gotten melted. I couldn't see anything with a quick look.

Any ideas before I try tracing the wiring?

Thanks,
Mike

Transmode Chassis Wring Diagram

From the light switch pin 3 there is a no 18 red dbl wht striped wire that goes through the 8-way connector that the wiring diagram says is under the instrument panel upper l.h. side. It powers the amber clearance lights on the roof. Each of them has a no 18 red dbl wht stripe wire feeding it.

From the light switch pin 4 there is a no 16 purple wire that goes through the 28 way connector (labeled OU on the diagram) located at the engine compartment dash panel upper r.h. side. It powers the front park lights and the front side marker lights.

Also from the light switch pin 4 there is a no 16 brown wire that goes to a 10 point connector located under the instrument panel upper l.h side of the dash panel. It feeds the rear clearance, marker, license plate and park lights.

At the rear located at the left rear "carling" (?) the side body harness to rear body harness is a 6 way connector where the brown wire comes from the front to connect to a no 16 brown wire that ultimately splits to all the running lights in the rear.

Maybe you can use some of these multi-way connectors to disconnect and isolate which area the short circuit is hiding.

I would disconnect each of those three wires from the light switch and measure the resistance to ground of each. The one that is lowest is probably the one you want to start tracing.

What did u do to get the clearance lights working? Usually if I have an electrical problem after doing wiring I re trace my steps. There are coincidences but commonly a new problem which arises immediately after work done can be traced back to an oops during the " repair"

Todd Sullivan

Sully
77 royale
Seattle

Todd,

I really hate it when I'm wrong. When I fixed up the clearance lights I cleaned up the ground to get one of them working. That wire was a brown wire, the hot. So as has been noted here, it was wired backwards. It looks like it may have taken a bit of moving around to get a good ground and blow the fuse. I rewired the light correctly and now two lights don't work. Need to get up there with the meter on those two lights and figure out how they are both wired. Thanks for your good advice and sorry I didn't take it sooner.

Mike
Toledo, Oregon
1975 26' Avion