ok so you have power at the plug going in to the stalk, but nothing coming out?
i presume the wiring has four wires for the light circuit, power in, then three out side/dip/main?
are you only getting power out the side light wire? if so and you are unsure of the meter readings bridge from power in to each circuit in turn with a bit wire and see if your lights work, if they do your switches are faulty.
also when checking for power at relays are you using the ground for the relay or a chassis ground? could the relay ground be faulty? that would still show 12v if you went from the relay to a chassis ground and not the relay ground if you understand what i mean.