I replaced by 12V IOTA DSL45/IQ4 converter today.
Everything checked out ok and the old one had a fried capacitor.
1. Turned off all electrical in TT
2. Disconnected shore power
3. Disconnected battery
4. Took out screws mounting converter
5. Disconnected white and black wires (blk to +) (wht to -)
6. Disconnected frame ground bare wire
Note: the lugs take a square driver, luckily the guy next door had one I could borrow
Before installing new converter, plugged it into 120V and measured 13.56V output
Installation was just reversed.
This unit has a smart charging module that just plugs into converter like a telephone jack and has a green light
I put a screw in this module and mounted it next to converter.
I plugged the old converter into 120V and measure 0 volts output.
I took the old converter apart and instantly seen a capacitor had blew its top :-)
Here is voltage on new converter, just plugged into 120V on bench
Here is voltage on old converter, just plugged into 120V on bench
Here is inside of old converter
I also checked my ground wire from the battery.
It is white and there is a grouping of white wires screwed to frame ground.
I also checked that all 12V system worked before connecting battery. They did.
All is currently well in Santa Cruz along the shore
Thanks again for all the detailed and helpful responses.