Mornin Indiana, good question, I couldnt count how many trailers Ive owned and how many had light problems over the past 50 years grrrrrrr SO OFTEN DUE TO A BAD GROUND !!!!!!
1) will your trailer lights and electric brakes work if the little battery on the trailer is dead?
YES ifffffffffff all else is okay ?????? the little trailer battery has to do with powering electric brakes should the break away trip. Lights fed off the connector are truck powered NOT via the trailer battery. Trailer brakes are NORMALLY powered off truck orrrrrrrrrrrrrr little trailer battery if break away is tripped
2) I have no turn signals or brakes but I do have tail lights. (NOTE tail lights working sounds like the ground is okay, but still cant be sure, maybe the trailer bulbs are bad or there's still another grounding problem ??)
a) FIRST thing to test is if the trucks trailer wiring connector (often 7 or 6 pin round or 4/5 terminal flat) IS PRODUCING A VOLTAGE OUTPUT SIGNAL WHEN TURN SIGNAL OR BRAKES ARE OPERATED ON THE TRUCK ???????? Check BOTH using the connectors ground pin for ground as well as the truck frame itself. One of the connectors pins is ground if alls well ?? THAT SHOULD BE IN PLACE
If NOT, are they working on the truck by itself ??? If NOT working on truck itself look for a blown fuse or a TRUCK wiring issue ......If working on truck but there's NO (Brake/Turn) signal at the connector, check wires on connector at source and at connector itself for Brake/Turn signal. .......Ifffffff theres a good Brake/Turn signal at connector, but no trailer Brake/Turn lights........
Check ground (trailer lights and at connector where one of its pins is ground) ......Check Bulbs..............Check wires all the way FROM connector TO trailer lights.......Check BOTH connectors and all wiring connections, Ive seen so many that are broke or corroded at the connectors
So often its a ground problem on the trailer orrrrrrrr a ground problem as wired to the connectors ground pin,,,,,,,,,,,or a ground problem in the light fixture,,,,,,,,,or a bad bulb.
NOTE I had MUCH better luck if I ran a dedicated ground wire TO EACH LIGHT FIXTURE instead of only relying on the frame as the ground.
They make testers you plug into the connector to see if all its circuits are working or else use a simple 12 volt test light or DC voltmeter. On many trailers the ground pin on the trailer end connector is connected to the trailers frame
TEST AND INSURE THATS A GOOD GROUND AND THERES A GOOD CONNECTION FROM CONNECTOR TO TRAILER FRAME Still fact the tail lights are working makes it seem ground is okay ????????
This isnt rocket science, a simple 12 volt test lamp or volt meter is all you need, got to have the Brake/Turn signal on BOTH truck and trailer connectors, good wires good grounds and good bulbs
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