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Old 04-15-2018, 10:14 AM   #2
Senior Member
Join Date: Jan 2012
Location: Central San Joaguin Valley, CA
Posts: 1,936
Some additional info would help:
1. are the running lights on or off?
2. Is the trailer cord connected to the truck?
3. Are the four-ways flashing on the truck?
4. Is it just the rear side marker lights or are the tail lights flashing?

My first thought would be that you have a short. Also, if you have a bad ground somewhere, the marker lights will dim when the turn signals are activated making it appear that they are blinking.

Jack & Marty
2018 Laredo 298 SRL
2011 F-250 SB Crew Cab 4x4 6.7L
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