LED's won't work with standerd bulbs on a flat bed

[JSpecht]

I have a 91 that we put a flat bed on and are running 4 round led stop/turn lights and 9 normal marker lights on the bed . We wired it all up and it keeps blowing the fuse when the marker lights are in the circuit, the lights light up just fine with no major load sparks like a shorted circuit with a battery pack. The leds work just fine with the markers out of the circuit, It will blow a 30amp fuse asap I can't see where I wired anything up wrong. Is there any reasion that LED's wouldn't work with normal bulbs????? This damn thing has me #@$%!

 

[KOG]

You have got a short somewhere. LEDs have no problem working in the same circuit with normal bulbs. I'm running leds on a dump body at the moment and encountered another oddball problem. The aftermarket cruise I'm using, Rostra, grounds through the brake light circuit to sense brake application (12V turns it off). The LEDs don't draw enough current to ground it so I've had to put a 10ohm resistor to ground from the brake light leads in order to make the cruise engage. LEDs also will not function with any standard flasher for the same reason. They draw so little current that the flasher thinks the bulb is burned out. But that's not why you're blowing fuses. There's a short in your marker light circuit somewhere. Try disconnecting one marker at a time or just start by pulling all of the marker bulbs. If it doesn't blow the fuse with all bulbs out, put them back one at a time. If it does blow the fuse with no bulbs, you can figure out the problem. Rewire.

 

[RGramlow]

Like KOG says, it isn't your LED's. I bet if you hook up just your marker lights they will still blow the fuse. There has to be some place where you have a power wire touching the frame or a ground wire, maybe just a strand that got wild while stripping the insulation off and it poked into the wire next to it if you have two wires taped together, I would check there first.

 

[JSpecht]

I would think that if they didn't work ok when I power them with a battery pack. They light up fine no sparkage when connecting the wires to the batt