the higher the ohms the more resistance
whether the resistance is additive or not depends on the configuration.
if the resistors are sequential then they are additive
3ohm + 3ohm = 6ohm
6ohm + 6ohm = 12ohm
if the resistors are parallel then you need to take the inverse of the additive inverse to determine the resistance
1/((1/3ohm)+(1/3ohm)) = 1.5ohm
1/((1/6ohm)+(1/6ohm)) = 3ohm
use this calculator if you're not a "math person"
http://www.1728.com/resistrs.htm
As for what's happening in this circuit... I can't say without knowing how the circuit is designed. unless you can get a wiring diagram you'll have to settle with "3 ohms per light works, 6 ohms doesn't" trying to understand WHY is quite difficult without knowing how the system is designed. ... for all I know the blinker circuit has a load sensor and if it's above OR below range it will go into hyper mode... maybe 3ohms is just what keeps it happy.
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