Hello Rod and welcome to irv2!
First locate your converter and check to see that you have 120v getting to it. If it is getting power then use a multi meter on the DC output lines. (If you don't have a multi meter get one, they're cheap) You should measure appx 13-14 volts. If you see 12.7 volts or less, there is no output from converter. Look for fuses at the converter and replace if needed. If still no output the converter may need replacement.
The best way to check converter output is to remove the 12 volt leads from the converter and measure directly at the converter output terminals. Depending on the model you have you should see appx 13.6 volts if it is working.
Please post back with your results and/or questions!
'98 Gulf Stream Sunsport 325, 7.5L Banks Power Pack, Koni FSD's, Air Bags, ReadyBrute Elite,
2000 Honda Accord