True Larry, However the best, keeping your sanity way, to trouble shoot an electrical problem is not to start checking all the components willy nilly. Your logic is correct and you may hit the problem right away, but I always try to start at the end and work backwards to be sure. Sometimes there are two problems working intermittently and so on. This is my opinion only, but I need to see the test bulb blink or not blink on left turn front. Then follow the line backwards. The key also is to isolate, wiring, switches, bulbs and other electrical components as you go, using test wires, test bulbs (bulb tester) and a different ground spot. Bypass/temporarily replace, the existing component or wire you suspect. Don't trust anything that is in place or any ground. Like you said, it may be the switch, so touch the hot of the switch to the left front feed with a test wire/jumper. If you are sure it is all wired correctly and the jumper makes it come on, then indeed, it is the switch internals (mechanical or electrical). Not trying be disrespectful if you know all this already. Never know someone's expertise when they ask for suggestions. Again you are correct, you can concentrate on the sw and test. Better idea than mine probably. The older I get, the more methodical I get (slower thinking).
