Hello,
We just purchased our 1993 U280 two weeks ago and after getting it home the ignition solenoid failed. Upon replacement with one that can handle 100 continuous amps I noticed that it gets very hot. The one replaced also would get hot. I see that there are many posts about this solenoid and would like to know if others are getting hot and if there is a fix for this.
If your ignition solenoid is getting hot, it is probably "undersized" in terms of amperage capacity. For your application, I highly recommend the unit linked below. Install it, and you will be good to go with zero problems for life. Shop around (online) for the best price.
L Solenoid - 12/24V DC 250A - Blue Sea Systems (https://www.bluesea.com/products/9012/L_Solenoid_-_12_24V_DC_250A)
See this thread for installation tips:
Ignition solenoid replacement (http://www.foreforums.com/index.php?topic=33712)
If you don't want to pay the high price for the Blue Sea 9012, then a Cole Hersee 24213 will also do a excellent job as a ignition solenoid:
Amazon.com: Cole Hersee 24213 12V 200A Continuous Solenoid: Automotive (https://www.amazon.com/gp/product/B005K2429I/ref=oh_aui_detailpage_o07_s00?ie=UTF8&tag=foreforums-20&linkCode=as2&camp=1789&creative=390957)
Thanks. That makes sense. I'll give it a try.
One thing to look for is continuous duty. In an older coach (when I was way younger) I had one go bad and then bought one that looked like it. About 1 hour into first trip after replacing I started smelling something burning. Pulled over and started searching. I was surprised to see my new solenoid that I had just replaced was about to start a fire. That was when I learned the difference between a starter solenoid and a continuous duty one.