Originally Posted by crazyluke4
well i need to catch ya'll up to speed on the bus anyways got tons of pictures to post but first I'm having a problem. SHE WON'T START! I narrowed it down to a solenoid that is in behind all the switches. It looks to me it is a solenoid for a child safety system that my bus has. Does anybody know how to remove this. I was just going to leave it because electrical stuff is not my thing and i did not want to cause a problem by removing it. but now it is making it not start so i'm confused. If ya'll are not familiar with it there is a button in the back of the bus near the door and the system is wired up to the flashing lights somehow so if you run the flashing lights the system thinks you have kids on the bus. so when you try to turn the bus off the horn starts blasting and beeping noises so before you turn the bus off you have to walk to the back and push the button making it so you can't leave kids on the bus. I have also removed the stop sign and the arm in the front that wouldn't have anything to do with this would it?
Well, one answer is "Don't tum on the flashers."
A solenoid is nothing more than a heavy-duty relay. A little electricity on the coil creates an electromagnet that connects the heavy-duty terminals. If the solenoid is a "permission" solenoid that regulates whether the starter motor solenoid has power, it can be bypassed. The easy way is to put both heavy wires onto one stud. However, if it is the actual starter solenoid, the starter motor will run forever, or for a few minutes until the fire, whichever comes first. The activation wire between the key and the actual starter solenoid may just go through the flasher switching to be controlled there.
To find out, park the bus in neutral with the parking brake set and/or the wheels chocked. Turn the key to the "run" position, but don't try to start it. Stick a heavy screwdriver or pliers handle across the two nuts seen above the middle finger knuckle in the photo. If the starter turns, it is a starter solenoid. If not, it isn't.
Most buses will have an accessory solenoid and possibly a run solenoid, so all the power to the heaters, wipers, radios, etc. don't have to go through the actual key switch. The key switch will just activate the solenoids to switch power the loads. In any event, the actual "brains" of the kiddie switch are probably in the flasher wiring, regardless of what the solenoid does. The solenoid is just the "brawn."
If you were close by, I would be willing to grab a meter and notepad to scope it out, but I suspect we are on opposite coasts. I usually only got into bus wiring panels only far enough to find a correct place to power the 2-way, but scoping out the whole system isn't too much harder once you learn how to test wiring.