run turn brake using relay

New to the forum and this is my first post.  I am trying to set up some dual circuit LEDs as Run Turn Brake Lights on the rear of my bike.  I have the brake and turn for each side run through a SPDT relay on the 'high circuit' of the LEDs.  I am using the run light from the front as a trigger for the relay so the turn signal flashes on/off instead of on/dim.

The problem I am having is when I wire up the run light to the 'low side' of the light they work fine as long as the bike is not running.  When I start the bike the run lights start flashing alternately and at different rates.  THe turn and brake lights still function normally. 

I have the lights grounded on a common ground and am trying to use the front run light feed for the rear (also wired to the relay) to avoid the turn problem I mentioned above.  I have also hooked the brake/turn relay to the low side of the bulb and am getting about 1 volt backfeed through the high side of the bulb wire. 

Should I separate the grounds?  Add a diode somewhere?

Sorry for no diagram but if someone will tell me how to draw one out I will be glad to show you guys how I have it wired up now.

Thanks in advance