Motor Home is LED toad is NOT

[Just_Lee]

I have a 2013 View on ayMercedes Chassis with LED brake/tail lights with a 7 pin plug. When testing with a 12 volt tester like this I get no light on the left blinker blade and no brake light on either the left or the right side.

Mt toad is a 1996 Geo Tracker that has separate running/brake and turn signals with a 4 pin plug (it was wired this way when I bought it) and I am assuming when plugged in to a MH it only uses the running/brake light for all the functions (running/brake/turn) and is NOT using the turn signal.

I bought a 7 pin to 4 pin cord but when I plug it in nothing works on my toad. Do I need to do something special because of my MH being ALL LED's?

Thanks LeeB