Normally a Locost's front turn signals are partially blocked by the tires. I mounted a pair of 1995(?) Nissan amber sidelights (old definition was "running lights") just in front of the foot wells on either side of the car. In studying an old American car wiring harness I found out how the manufacturer wired the front sidelights to also act as turn signal indicators.

1. The sidelight HAS to have both leads to the bulb isolated from ground and available to do this modification. Your sidelight can NOT be wired as a turn signal and a running light using this method if it has only one lead and/or the bulb shell is grounded. The Nissan and most newer cars do have isolated grounds on the bulbs. So check out the sidelight you plan on using -before- you wire it up.

2. The sidelight bulb has to be a bulb that draws less than 3 watts.(See theory of why this is necessary.) Nissan uses a 2 c.p. #194 bayonet bulb.

Wire one lead of the sidelight bulb to the "hot" parking light lead and the other lead from the sidelight is connected to either the left or right turn signal "hot" lead. That's it!

The left and right turn signal circuits use hi wattage bulbs to give a bright turn signal illumination. The normal parking lights use bulbs that are generally 4 watts or more each (for a total of 16 watts as a minimum). The amber sidelights use a rather small wattage bulb in comparison to the other bulbs on the circuit. By wiring the #194 sidelight bulb as described above,  the #194 can be illuminated by the active circuit (either turn or parking light) and uses the -other- lighting circuit to "ground" the bulb.

Lets assume you turn the parking lights ON and at that time both the left and right turn signals are OFF. The sidelights see 12 volts on one lead of each bulb. At the same time the -other- lead of each sidelight is connected to their respective turn signal circuits that are not energized. The bulbs of the turn signals present a low resistance path to ground. This causes the low wattage sidelight bulb to illuminate through the turn signal bulbs. The turn signal bulbs don't light because the sidelight bulb can't pass enough current to allow them to light.

Now let's assume you have the parking lights ON and you now turn ON your right turn signal. When the turn signal circuit has 12 volts on it to flash the turn signal bulbs the sidelight will have 12 volts on BOTH leads. This will cause the sidelight to flash OFF because there is no voltage drop possible across the bulb. The same situation applies to the left turn signal.

Now let's assume you have the parking lights OFF, and you turn ON one of the turn signals. When the turn signal circuit has 12 volts on it to flash the signal the same 12 volts will be on one of the sidelight wires and the other wire of that sidelight is grounded through the parking light circuitry.

The interesting thing about this circuit is that when the parking lights are OFF the sidelights flash in cadence with the turn signals. When the parking lights are ON the sidelights flash ON when the turn signal lamps flash OFF!