12 volt devices that Work need lots of amps.. and heavy wire is key for proper operation...
when I installed my power jack... I used an old style Ford starter solenoid... and a rocker switch. mounded same under the propane cover and fuse is inside battery box..
or run a dedicated power wire from truck battery to rear bumper.. with fuse.
do not use 30 amp headlight relay.. not UP to the job.
2012 Ford F 250,"XL" 6.2L Gas, 2 wheel drive. 145,000 miles
2005 Coachmen 29FKCS, Front Kitchen... 2005 Honda VTX1800F
N.E. Ohio in the Spring, Summer, Autumn.