I would think a simple relay to each, If the relay isn't active or ( closed ) it can't back feed to the other circuit

 

I guess that's where I goofed. I guess I figured that the flasher relays were.....relays and adding a second relay to each or one of the circuits would be relay overkill.

 

Here's a diagram that I found that seems to show my set up. Not sure I understand it though:

The single pole/dual throw switch on the upper left should be how the turn signal switch works. But the other switch, for the flasher function, is a dual pole/single throw switch. I don't think the switch I'm using can be configured like that.

 

Yea, your right, you would have to have the double pole/single throw switch as it isolates left from right when not in use

 

I've been looking at bunches of googled Turn/Hazard wiring diagrams. The dual pole switch seems to be what I need. I have some extra switches, maybe I can check to see if I can configure one to have 2 outputs. Here's another diagram that uses one flasher relay to do both Turn and Hazard functions:

This diagram seems to show how to isolate the Turn and Hazard, as Terry suggests, using two relays, but it only uses one flasher relay:

This diagram seems to show how I have it wired using 2 diodes and a single throw/single pole switch, but it only uses one relay:

I actually found very few 2 flasher relay set ups, most just use the turn signal flasher and either a dual pole Hazard switch, or several relays, or diodes. Considering the complexity of the circuits I looked at, my solution using a SPST switch and 2 diodes, and 2 flashers, is actually elegant in it's simplicity. It wasn't really my choice to use 2 flasher relays, the fuse box came with 2 separate Turn/Hazard relays and they are separate circuits with their own fuses. I could just as easy use just one of the circuits and one relay and wire it up as shown in the diagram above. The unused circuit and flasher relay would just be an extra unused circuit. The only reason I wanted to get away from the diodes is because they are fragile and where I have them, under the carpet on the side of the tunnel, is right where I lean my leg. If I had them in a different safer location, they wouldn't bother me at all. I'll be wiring this car differently, so I should be able to put them in a better place.