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Hi my name is Robert......
Sounds like you have a bad connection point if the light went out when you went over the grooves. IF the unit sat for 6 years I would have the batteries load tested to start if you did not test them. Make sure the cable ends are secure and the main ground to the frame is clean and tight. Inspect the cables from the battery to the starter and make sure you do not have a cable resting on the frame or any screws catching the cable, have seen that before on other Monaco's.
I would also check the chassis fuse box look for any loose corroded wires, also if it sat look for any signs of rodents as they can chew wires and cause all kinds of problems. Sometimes they will also use a male and female plug that plugs together for the 12 volt wiring, if you see any I would make sure they are not loose or corroded.
I might also replace the fuel filters again on this just to be sure they did not get plugged up from sitting..... Hope this helps some.... Robert
Should only have two filters on this... Monaco and Holiday Rambler used the same chassis's with the same engines.
IF the unit sat then it could very well be the fuel, it should have been drained prior to starting, if it was not drained then I would try another set of filters and see what happens.
I can put your question back up for other experts, My goal is for you to be satisfied. The 97 and 99 are different, the 97 should be mechanical and then in 98 they want to an electronic engine, if it is a ISC you should be able to turn the key and heat the fuel lift pump run and then shut off. The older ones like the 97 used a fuel cut off solenoid, I would not think the 99 would have that. In any event maybe another expert can assist you, If you would like a refund please let me know. Robert
I agree with Robert here.............and really can't add anything more. Everything he mentioned is spot on!