Once my contacts are are all working good I usually quirt some WD40 into my sockets before connecting up. Seems like we all have duct tape - bailing wire - can of WD40 in the side pocket. Squirting WD40 in and then moving the plug around abit to get the WD40 into everything. ALot of folks like to use the dielectric greese from a tube which is probably better than the WD40. I've never tried that...
The idea is to keep the corrosion down alot from sitting...
Good idea sticking the 7-way cable end between the two propane tanks cover out of the weather. I do that as well when the trailer is just sitting there...
If the blades are too bad to use you can purchase a 7-way cable from ETRAILER.com and hopefully it will will have the same color sequence your old one has. Would be easy to replace/hookup in the cable connection box. Mine is located just under the trailer side where the tongue area start. Standard Electrical box is what is using. The cable wiring is color for color inside the electrical box using those large YELLOW twist wire nuts...
Sounds like to me it is just grit and grim on your blades and sockets...
I back-in and hook up and usually pull my trailer out from where it is parked in a long section of the driveway. Then I can get out of the truck and do my DOT safety light inspection walk around before I leave my somewhat circle driveway... If one light isn't working then I squirt more WD40 into the socket and move it around some more. This usually fixes the non-working light not working due to grit and grim on the connections.
Then the second test I always do is when I start out on the side road before leaving my house area I will use my Electric Brake Slider knob ONLY to stop the truck and trailer at the stop sign that leads out to the main road. This gets the moisture out of the brake drum area and makes sure my Electric brakes are working....
Guess we all have our working routines that works best for us hehe...
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS