Hi guys

73 240 box stock

Right turn sig is perfect.

Left turn: rear light flashes, but no flash in dash or front left.

The bulb and wire to the harness in front are fine: i checked. I pluged the left front harness in to the right socket behing the grill and it flashes fine

The flasher thingy (round plugs in under dash) is good, I swaped it out: same thing.

Any suggestions would be greatly appreciated

Check the sockets and bulbs, especially on the left front. My guess is that the left front bulb is out.

if you read my post you'll see I have emliminated that possiblity.

upon serching it looks like it could be the combo switch on the wheel. I'm gonna spray some contact cleaner in there.

I didn't see how it could be the combo, since my rear blinker works, but one guys swears that bad combo contacts can produce these symptoms

BTW my hazard lights work perfectly.

The front and rears are separate contacts in the column switch, so that definitely could be your problem.