Stereo & Electronics - help with trailer lights please

just bought an old car hauler and put new lights and wiring. The problem is only the left tail light and side markers are working.

No blinkers or brake lights on either side.

I can touch the mounting bolts for the right light to the trailer and it will come on but still no turn/stop.

I obviously messed up somewhere. Any help would be appreciated.

bad ground on that side maybe

side markers work on both sides.

only have 1 ground on the tongue

pentavolvo is correct - it could be a ground problem. If you are relying on the hitch ball to provide ground or there is a bad ground for some other reason, the lights will ground through the other filament of the dual filament bulbs (1157, 2057, 3157, etc.). That gives you running lights but when you try the brake lights or turn signals there is no alternate path to ground so the lights don't work.

Also, does the tow vehicle have turn signals separate from the brake lights? If the tow vehicle has separate bulbs but the trailer uses the same bulb for brake and turn signal then you will need an adapter to connect them.

i ment at the individual bulb, there is only one wire and the bulb socket assembly screws to the frame providing ground there could be rust there. trailers are notorious for ground problems due to corrosion

thanks for the help guys but it was just blown fuses in the truck (06 f-150). everything is working now.