DF140 2011 PTT issue has me bamboozled

[T-Slap]

Hi all.
I have read a lot of the FAQs and believe this issue hasn't been covered.
can anyone tell me why the PTT would work perfectly at the motor and not at all at the remote.
Here is the tricky part. The switch and wiring are fine. i.e. With a multi tester, I get 12.7V at the blue and pink wires at the connector to the relay when operating the remote PTT switch. I also get 12.8 V at the same connector when operating the PTT Switch at the motor. So why does the remote PTT not work if both circuits are giving up and down voltage at the relay?

[redlowrey]

Will the trim work from the remote with the engine running with the higher charging voltage, I will get a better understanding of whats going on then. You would not think that a voltage drop of 100mv would be difference between the pull in winding energizing or not.

[T-Slap]

Thanks Red. I found a join in the control wires near the remote. They were corroded and everything works after re-joining them.
cheers.