Ahh, much better. The first two sets of measurements confirms that there is a voltage being introduced onto the blinker circuit when the marker LED's are installed. The weird thing about this is that this should not be possible as the marker lights should only have one wire going to each light which is part of the parking light circuit.
When you were measuring the voltage on the blinker wire are you sure that the voltage was a positive 5.9V and 6.8V? If it were a negative voltage then you have a bad ground somewhere between one or more marker lights and the cars battery. Most likely the bad ground will be right at the marker light socket.
If it really was a positive voltage, then try unplugging the tail light bulbs and measuring again as the tail lights are another place where both the parking light and blinker circuit come together. The front parking lights are also another place, but in a previous post you stated that disconnecting the digitails blinker wire did not prevent the dash indicator bulbs from lighting so that means the digitails probably are not at fault.
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