I'm having a hair-pulling issue where all the running lights on both my trailers work, but signals/brake lights do not. Checked all fuses, and I'm getting voltage at the appropriate pins on the Tundra's 7-pin connector. However, when checking, I've discovered I've got 12v (engine off) on the running lights pin, but only 9.5-10v on both brake/signal pins. I've also discovered the signals/brake lights on the trailers will do a single dim flash when the running lights are off, then do nothing. Ground connection is good. I'm wondering if anyone's had this issue, and I'm starting to think the only possible problem spot could be the flasher relay (bad or oxidized contacts within the trailer side of the relay - can't find a pinout/schematic to check my theory). Don't want to drop $75 for a new flasher relay if I'm missing something else to try first. Thanks in advance!
edit: should probably mention I've got factory tow pkg
edit: should probably mention I've got factory tow pkg