It is to start the vehicle if the "main" battery is dead, in other words, there are additional batteries that power the lights, etc. in the motorhome, and a battery that is reserved for the engine. If this "engine" battery dies, the motorhome can still be started - hooray - by pushing this button which uses the other batteries to start the engine. We experienced this first hand on a cross country trip. Another piece of information that we didn't know - the generator will not run if there is less than 1/4 tank of gas, so always gas up before you are that low - we learned the hard way when we got a flat tire in Oklahoma City in July on a 100+ degree day and could not run the A/C through the generator while we were waiting for road service. Good luck! We have a 1993 30 foot Rockwood.
Try your emergency fuel shut of button reset, light collisions and overturns can trip it.
check motor mounts
Battery or Starter motor.
it starts but the oil light stay on
you left your emergency flasher on overnight
Either your gears are not locking at the start or you are in park or neutral or emergency brake on.
an oil light is designed to come on when there is NO oil pressure or LITTLE oil pressure. that said, when your oil light is on before you start your engine there is NO oil pressure to turn it off until you start the engine.
It sounds as if the problem could be your main relay switch. I had the same problem w/my 90 si replaced it and problem solved.
capacitive start motors start by themselves however a normal single phase induction motor requires a starter motor to 'kick-start' the motor into action.
You can only turn off the headlights by applying the emergency brake. When the emergency brake is on, the headlights will not light. Otherwise the best of my expererience is that they are on all the time. If you have remote start, put the emergency brake on before you leave the vehicle and when you remote start it, the headlights will not be on, but the driving lights (if switch is on) will be on as well as the parking lights.
I assume your question relates to the need for a disconnect switch. To meet code you need a disconnect switch in the proximity of the motor so that should the need arise the motor can be disconnected for safe maintenance or in an emergency. The motor will work directly connected, but you will create a safety issue.
First of all, I don't think the 2 are related...hard to start and the brake light thing. As far as the emergency brake-I don't recall, but the light staying on might signal that a brake light is burned out. I'd check my brake lights first. Second, and I don't know this for a fact either because I never looked on my LUmina. But on other cars, here's what I'd do: after releasing the emergency brake, take your foot and pull out on the emergency brake pedal to make sure it's returned all the way out. If the light is still on, look under the dash at the emergency brake pedal and locate the "switch" that's activated by this pedal and make sure that the switch doesn't need adjusted. When the emergency brake pedal is fully returned, it should not be STILL hitting the switch. You can adjust this switch. Assuming I'm correct about the switch being there...after I verified that the switch is not needing adjustment, I'd fiddle with this switch (spin the plunger, check the wire connection...things like that) to see if I could get the light to go off...indicating that the switch is frozen. After this I might disconnect the wire to the switch to see if the light went out.