You have been chasing this long enough.
Right now, do not worry if the voltage is 12.2 or 12.8 volts. When you turn the key the solenoid should click. If it is not doing it, then go get a
reliable meter or better yet a 12 volt automotive test light.
https://www.harborfreight.com/612v-circuit-tester-with-5-ft-lead-63603.html?_br_psugg_q=12+volt+tester
Look at the wiring diagram and start diagnosing the problem. Forget adjusting things until you prove with your meter or test light the absence or
presence of +12 volts at the various points along the circuit.
You have already determined the absence of +12 at the solenoid on the small wire. So back up from there until you find the =12 volts.
If you do not have the wiring diagram go to
www.bdub.net and download the diagram for your year coach.
http://www.bdub.net/wirediagrams/
You should be able to find this problem with a test light or meter and a diagram in 30 minutes or less. Once you find the failing component we can
find out what is wrong with that component.
I am looking at the diagram right now. It says:
1. the wire on the solenoid is 12 ga. purple and goes to the neutral safety switch.
2. from the neutral safety switch the circuit then goes back on another 12 ga. purple wire goes to the ignition switch.
3. going back from the ignition switch the circuit goes on a red 12 ga. wire to a terminal on the horn relay located under the passenger side hood.
This is the same terminal where the fusible link black 16 ga. wire is located.
4. The circuit then goes through the fusible link wire to the "Battery Pick Up Junction Block" which is 4 to 6 inches away from the horn relay
terminal.
That that is the entire circuit. I do not care if you start at the "Battery Pick Up Junction Block" and work forward or start a the solenoid terminal
and work backwards. Either way should lead you to where the circuit is open / failing.
Keep in mind that you may now have more than one failure because you have been removing plugs and adjusting switches. That is why we say diagnose
first and prove the failure before trying randomly to fix something.
Ken B.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana