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I C this post is dated April, so maybe OP has solved problem.
Most likely a stuck simmerstat (controller) which needs renewal.

RoadPro... | Answered on Oct 05, 2018

I would guess the blue is POSITIVE, and goes to the tip of the lighter plug. However, get a voltmeter and check...

RoadPro Road Pro... | Answered on Dec 27, 2017

eBay is your best choice for these items.

RoadPro... | Answered on Nov 17, 2016

Did you ever find an answer to fix your problem?
I have the same type of problem, and feel bad as I am an electronics tech with years of experience. I know that it must be a bad IC, transistor, capacitor, diode, resistor, etc. However, with all the components in the 2500, it is almost impossible to trace it out without a "Service Manual" or a schematic diagram. To blindly go in to just start 'tracing' a circuit and not knowing the wiring is not good to do. It is also almost an impossible task to simply start removing parts to test on the bench, and then reinstall. Even IF all test good, there can be a fault on the board itself. For an answer you can do as I am doing, and that is to call the company that is listed as the company involved with customer service.

Customer support/contact, Truck and Automotive Accessories 1875 Zeager Road Elizabethtown, PA 17022 Sales & Customer Support Toll Free (866) 622-7979 [email protected]/roadpro

If you would need to hire a tech to find the problem he would have to be a good friend to volunteer his work or the cost would be as high as buying a pure sine wave inverter.

Take care, Dave. (DJnRF at yahoo)

RoadPro... | Answered on Jul 23, 2016

There is a battery inside which may need to be replaced. To check, run the compressor (it runs off
the battery) - if the compressor dies quickly, then the battery has failed to charge and would
need to be replaced. You may want to check your Warranty Management software (or
shoebox) to see if your Starter/Air Compressor is still under warranty - if so, replace it.
Duralast products are carried exclusively by AutoZone, Inc.
The Duralast web site: is useless - it only shows automotive parts,
and I cannot find the product at, so it seems that AutoZone fails to support this
product with replacement batteries or other replacement parts (or even an online Users manual).

RoadPro Road Pro... | Answered on Apr 25, 2016

I called the Service Call Center and they said that "FL" means the battery is fully charged, which is the way it is shipped from the manufacturer.

RoadPro Road Pro... | Answered on Dec 28, 2015

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