plasticmaster wrote:
Is there anything more permanent I can do to ensure a good connection so I don't have to rely on the air compressor? Thanks.
Yes, when not in use or towing just tuck the connector back under the propane tanks on the tongue making sure the cable has a little droop and the plug is above that droop.
The propane tanks create a natural shelter from the rain and the droop in the wire creates a drip loop that stops water from following the wire to the connector end.
No greases, no air compressor, cleaners ever needed if you simply shelter the plug.
You still do need to periodically check and clean any corrosion on the connector since they are typically brass and brass naturally oxidizes from moisture in the air (the oxidation creates a nonconductive layer on the surface). For oxidization, I fold some sand paper a few times then insert it into the connector to shine up the brass.