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I'm guessing that the 8.6V is voltage that is back-feeding thru the tail light? The easy way to check this is if you have access to the relay, unplug the wire that has the 8.6V on it and see if the 8.6V at the tail light is still there or goes away. If it's still there, then the voltage is coming thru the tail light onto that wire from the park light circuit. I'm a bit confused about what the relay does that you're talking about or how it's wired or what it's wired to control.....but I'm wondering if the 8.6V is just voltage that's backfeeding thru the LED's in the tail light, your solution might be to get a resistor (maybe 100 ohm or so?) and connect that from the wire that has the 8.6V on it and run the other end of the resistor to ground?