Does the weather get in? There are two issues: there is a rectangular slot for the connector and that would require sealing, and condensation. What I suggest is to use a conformal coating on the electronics.
That's all from me today as I need to go into the office and do some urgent equipment repairs. Last night I put together a little circuit board that will simulate the VSS and I have mounted a knob on the Morgan Loom panel that will be marked 6mph to 60mph. That needs connecting up and testing. I am now certain that the vehicle speed has an effect on the TSM's behaviour: the next few days should give us the answers.
One final comment: there are two 10A relays on the board yet the current sensing circuits cannot provide anything like that power. The repeater lamp is probably a bulb and maybe 5W 12V and the front and rear indicators are LEDs using less power.
This leads to a question for you chaps: are all indicators LED or do some vehicles use 12V 5W bulbs or similar?
