Here is the European to US Trailer converter 3 => 2 w/o voltage drop caused by diodes. I have designed this for my own purposes. This could be the same schema Mike mentioned. You need: 2 pcs change over relays (12 V automotive or general) 2 pcs 1 Amp diodes 2 pcs electrolytic capasitors some wire, connectors etc. And it works as follows: If the ST wire has + 12 V then both LTS/ST and RTS/ST has + 12 V. If LTS has + 12 V then its relay is energized and connects it to LTS/ST. If both ST and LTS wires have + 12 V then LTS is dominating. While LTS flashes + 12 V on/off capasitor keeps relay energized during off -periods => same tact and flashing rate as in towing vehicle. Selecting capasitor value (voltage rating 25 V preferred): First measure impedance of your relay. If you have automotive relay its impedance might be 100 to 150 ohms and general relays could be 200 to 300 ohms. 100 ohms => 3300 mikrofarads 150 ohms => 2200 mikrofarads 300 ohms => 1000 mikrofarads These values give about 500 ms off delay to relay. Schema: Diode: (anode)--D|--(cathode) Capasitor: __|__ + terminal |____| ------- | - terminal Relay coil: __|__ |__\__| | Poles of the relay (drawn as de-energized) n/o ---o /o--- c n/c ---o/
GND = GROUND TL = TAIL LIGHTS LTS = LEFT TURN SIGNAL ST = STOP or BRAKE LIGHTS RTS = RIGHT TURN SIGNAL GND ---+--------------------(white)------------------------ GND | TL -----------(brown)----------------------- TL | | LTS ---+-------------------------------o | | /o--- LTS/ST | +--D|---+-------------+ o/ | __|__ __|__ | | |____| |__\__| | | ------- | | | | | | +---------------------+-------------+ | | ST ---(red)---------------------------+ +---------------------+-------------+ | __|__ __|__ | -------- |__\__| | |____| | | | | | +--D|---+-------------+ o\ | \o--- RTS/ST RTS ---+-------(green)--------------o Hope this will help someone. Juha Koivisto 88 Vanagon (Caravelle) 1,6TD (old school bus with 9 seats) TURKU, FINLAND
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