Setchell Carlson...588 dial, 407 cab, 420 chassis(?) Serious need of a schematic.

[marloubow]

Reece,
It's about an 11V surge, then comes to rest at 4.94V with bulb present.
Without a bulb in the socket, it surges to the same, but settles in at 8.31 (+-).
The replacement bulb being used is 6.3V/15A

Will check out the switch options.

martin