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You may be exceeding the limits of your tow vehicle. Have you added extra fans in the radiator, Have you installed an external transmission oil cooler? Is the radiator free of contaminants that might block the flow of coolant? Do you use a lower gear on grade so the engine revs are higher so the engine doesn't have to work so hard? Is the flex fan engaging when engine temperature rises? Once you check out all the items on the list, you will discover the fix.
Damon is presumably the company that built and equipped the RV body using a donor vehicle as the base or a bought-in rolling chassis from another manufacturer.
That is the way these things usually go. Coach or body builders and vehicle manufacturers are usually entirely different things, though they try and pretend to the customer they are not by avoiding naming the brand of the base vehicle and withholding information about it.
The result is the customer who gets problems usually finds great holes in the information provided and isn't sure who to turn to for help.
The RV market is a lucrative premium market and the suppliers don't want you buying stuff from Ford or wherever at normal prices; they want you to have to go to them and pay their premium prices.
Basically you need to do some research and discover the origin of the base vehicle and then go there for information.and other stuff. Bear in mind the modern vehicle has lots of electronics controlling just about everything and there is a severe limit to what owner/drivers can do without specialist gear and knowledge.
I had a similar trouble with an RV based on a Fiat Ducato. The RV manufacturer could not or would not help but I obtained a partial wiring diagram from the Fiat dealer. It showed me a number of large fuses hidden behind the battery and one was broken, presumably by the builder, and had finally parted...
www.pradopoint.com > ... > Suspension (120 Series) Dec 18, 2012 - 15 posts - 8 authors
Found rear suspension not working Hi - Lo / auto level not working at all. Show toToyota dealer, informed air compressor faulty need replacement, but they do ... I have a2003 grande and the same symptoms as mentioned;
you might not be getting a injector pulse signal at # 3 cylinder ? easy way to check this is with a noid light, it plugs in to the end of the connector and as crank the engine the light should flash. if it does not flash check wire harness for a open circuit from injector to computer ( e.c.m.) if thats alright possibly e.c.m. bad . if you cant find noid light you can use a digital volt meter. good luck
If you have a block heater, there will be an extension cord type plug somewhere near or under the front grille (sometimes you need to find the heater and follow the wire to find wherever it got tucked in) That gets plugged into an extension cord from the house power.
use a meter to trace the wires ,its a surmountable problem.try checking the earth connection on the rear lights and putting an additional earth wire on as well .the problem you describe is classic earth problem on rear light clusters,or in american the pigs tail.Now where did that come from ??dont play with it till you put a new earth cable on to ground and a bit of grease on the body connection and iam sure you find it all works.