The last day or so all of my instruments (gauges) inside the Batwing on my 87 FLHtC as well as the horn, nuetral light, turn signals and radio would stop and than come back on?

Now all has stopped working.....? With all of the experts onboard here, where do I begin?

 

Sounds like you've lost a ground some place.

 

 

I will have to recheck the wiring diagram, It looked like each instrument appeared to be depend to ground. I was thinking ..maybe ...a relay / breaker?

 

Study the wiring diagram and look for a common ground point for the instruments that died. Start your search there.

 

My 90 had broken wires at the harness flex point were the harness moves back and forth with the front end . Check this point for broken or weak wires in the harness. Also check/service a ground buss located at the left fork.
Removal of the headlamp will get you to the bolts for removal of the front batwing and that will give you access to all the old 1987 wiring and connectors that after 26 years will need some TLC.
Do a " stretch test " on the harness wires at the flex area descibed above.
26 years of this harness moving back and forth as you steer will weaken the wires to breaking or weakening point.
This is how ... park bike with bars full left , remove anything in your way to access as much of the harness as possible , slice through the wrapping to get to the individual wires. Mark the actual pivot/stress point on the wires , use 2 needle nose pliers to attach to each opposing end of each individual wire to try to " stretch " the wire.
Stretch each wire forcefully with the pliers.
You will be able to pull apart the weak and open wires with enough force.
Repair the wires with appropirate butt connectors and heat shrinking covers etc.

 

Removed headlight, batwing and what not...of the four circuit breakers all show correct voltage except the fourth one which is the one needed for the outage..
Trying to find the lost voltage?

 

The accessory (tan wire) gets voltage from the starter relay under the right side cover.

 

Schex3x,
I followed the heavier tan wire from the rear of the circuit breaker down to the starter relay.....yep bad relay...

 

Thanks for all of the input👍. I am now back on the road until the next issue! LOL