Sorry, but I'm not following your question. With add-on directional blinkers most problems come from one of 3 things...in this order: 1 bad ground connections at the bulb sockets or bad bulbs, 2 bad contacts within the switch unit or 3 a bad blinker module itself. If your ground connection at the bulb sockets isn't really good, you'll lose ground there and then your other bulb on that particular side won't blink (leaving the bulb on the switch itself staying on but not blinking). If you have bad contacts inside the switch, the same thing will happen (although this is less common) and if the blinker module is bad it may work intermittently...however this will affect both bulbs on the right or left circuit or all 4 if in hazard mode.
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~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end