Is this the location?

Secondly, does the gauge of the extended bit of wire need to match that of the pink wire? Could that be the issue?
I have the flasher unit, so do I need to connect both green plugs (one is a double and the other is a single) into one plug for the new EL13 unit?

When I connected my probe to ground and touch the RHS flasher, the probe matches the amber hazzard flash. When I ground it and touch the LHS flasher wire, the probe doesn't flash, but the red lights flash.
I think I am stuck using hand signals if I do drive the truck this summer. Completely stumped.
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