I added running board lights and tapped into my parking light circut but the lights works sometimes and other times they don't I heard the newer trucks had a funny circut but I'm only tapping for 12 volts, anyone else have this issue?

 

Many of the circuits for lights, etc. are protected from overload by a FET circuit. You may be right around the maximum allowable current draw for the circuit and sometimes the FET shuts the circuit off, other times it doesn't. What type of lights did you add?

 

Do your parking lights continue to work? If they continue to work, then the issue is with your add on lights, one of the connections is bad. All the circuits are 12 volts, the only thing "funny" is the truck will sense an overload and shut the circuit off (parking lights)rather than blow the fuse.

 

Don't run current directly from the circuit to power the lights. Use a relay.

 

OPTI 7 they scan with the turn signals

 

Ok I don't know that thanks

 

Use one relay for both sides?

 

One relay is fine, unless you plan to exceed the current capability of said relay. That would be a bit excess for clearance markers.