Front Sidemarker & Park/Turn Lamp Wiring Diagram – Alternating Flash Mod

This document is a simple color-coded wiring diagram (titled by the uploader as 'Side marker after') showing how front parking/turn signal lamps and front sidemarker lamps are wired so that the sidemarkers flash alternately with the turn signals. It depicts LH and RH dual-filament park/turn bulbs, each grounded to the chassis and fed by a green parking lamp feed (+12V when parking lamps are on) plus a turn signal feed — red for the left turn signal (pulsed +12V when LH turn is signalled) and purple for the right turn signal (pulsed +12V when RH turn is signalled). Each front sidemarker bulb is connected between the parking lamp feed and its respective side's turn signal feed rather than to ground. A four-entry legend defines the wire colors: green = parking lamp feed, black = ground (body, chassis, battery negative), red = left turn signal feed, purple = right turn signal feed. From this diagram a reader can learn the post-modification wiring arrangement that makes sidemarkers alternate-flash with the turn signals: when only the park lamps are on, the sidemarker completes its circuit through the turn filament; when the turn signal pulses, the voltage difference causes the sidemarker to flash opposite the turn lamp. No year, model, part numbers, fuse data, or connector details are shown.