Originally Posted by Infogypsy
Sounds complicated. The hitch people do have the plug tested and working.....
It seems complicated because it's unfamiliar.
If you think of it as having a bunch of garden hoses connected together so you can run a sprinkler way out in the garden, you know that water is coming out of the faucet (battery has juice) but not coming out of the sprinkler (tail light
not getting juice) it' really no different than moving along the joined hoses opening each connection one at a time to see if the water is making it that far.
If water (electricity) gets to this hose connection re-connect and move on to check the next hose connection. When you find the hose connection where there is no water you know the kink or leak is between there and the last connection that had water.
Your repair person now knows that power is getting to your vehical plug he is in effect half way down the hose leading to your tail light
. Can now check between trailer plug and tail light