The left (first) switch on the ramp is working, but does not activate the diverter to send the ball down the left hideout. I checked the switch by hand and with the ball, and the switch activates the lights (flashers) and registers that the ball has passed, but the diverter does not activate until the right switch (second) is activated.

What this means in the game is you always get 2 ball multiball and not 3 ball multiball because the ball never goes in the left hideout.

In reading other past posts I assumed that the switch was dirty or not adjusted, but it seems to be working fine. I have not taken off the ramp yet, but will if I need to (I'm a newbe at this ramp stuff).

Loose wire? Another potential issue?

Nice - I should have just called you! I need to check that, but might need some help.

Did switch checks as well as manual check - the all work. Not a switch problem. Other ideas anyone?

I will do a visual check tomorrow. All switches are working, including left hideout. Not sure if there are 2 wires from the diverter switch - one to register the "loop" and one to activate the diverter.

Yes, switch edge test and manually activated the ramp and hideout switches. Both diverter arms come out, but only with the second (right) switch.