We don't have backup lamps on the trailer (and have not probed the connector to check backup lamp function) In a separate relay box are 2 more related relays.īattery charge is working. Note that the Fuse 8 description references a trailer tow park lamp relay - We have not located that and it sounds like a likely suspect. When this is the case, the lockout should be connected to the backup light circuit of the tow vehicle. NOTE: The fifth connection is sometimes used on 5-ways to power a reverse lockout on trailers with surge brakes. (First 2 only have power when the associated truck lights are on - not when they are off.) Use a circuit tester to verify connections. The Power Distribution Box under the hood holds the majority of the tow package related fuses.Ĥ Trailer tow backup lamps, trailer tow park lampsĨ Trailer tow Electronic Brake Illumination, park lamps, trailer tow park lamp relay coilĢ8 Trailer tow electronic brake controllerĪll fuses are good and we have power on both legs. ) Both are good and we have stop signals on the truck and the trailer charge is working. There are two fuses inside the truck (13 - Stop lamps, trailer tow stop lamps.
#7 pin trailer connector troubleshooting manual
We have the owners manual and went through the appropriate section. but possibly all in the trailer not wired correctly Run a tem ground from the truck to the trailer if that solves your problem ook for broken or corroded ground wires to truck frame and grounds on the trailer. (Trans was just replaced) But we have no idea where to look.Īny suggestions or anyone have a wiring diagram? Son is starting to look for matches as a permanent solution. There is probably a connector for that which is disconnected. We figure the harness to the trailer must be a Y harness with a feed from the brake controller (which is working) and a second branch feeding from the regular lights. Not sure if the two we found are for trailer or trans. Two for trailer tow and two for the transmission. The owners manual references four relays that are not in the main fuse box. There is power to the trailer specific turn and clearance light fuses in the fuse panel when lights are on and not when off (expected) (Not sure about trailer brakes themselves)Īll fuses are good. But no clearance lights, no turn lights and no brake lights if the brake controller is removed. 12v charge circuit is live when truck is running. Manually apply the brake controller and the brake lights come on. Son just bought a 2001 F350 with a 7.3 PSD.
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