NEED HELP WITH HOOKING UP JEEP LIGHTS

[Island Bus]

1992 Marathon....Cannot get power (LT/RT/Brake) signals out of aftermarket converter box.Have tried two different boxes.I have done this many times on other coaches,but this is our first Prevost.Thank you in advance,Mike....(503)310-8272 Pacific NW :confused:

[Hoffman]

I'm not sure what an 'after market converter box' is, however I have had similar issues when trying to measure the voltage at the connector pin while trying to diagnose toad light problems. Did you try it starting the engine? Perhaps your ground reference isn't really a good ground?