I checked and rechecked the connections and terminals.  All are correct.
I think there must be an issue with the locomotive.

I recently purchased an O Gauge Amtrak Locomotive (Williams by Bachmann 156) to run on track powered by a Lionel GW-180 transformer.  The lever on the transformer has a 4-phase cycling sequence when the lever is raised - Forward, Stop, Reverse, and Stop.  The lights on the Locomotive are bright and the sound is audible only on the two Stop phases.  When the transformer is switched to Forward or Reverse, the loco lights are dim and the sound is barely audible.
Is there an adjustment I can make on either the locomotive or on the transformer that will allow the lights to be bright and the sound audible in all four phases?
Is the Bachmann Amtrak locomotive not compatible with the Lionel GW-180 transformer?  Do I have to run a Lionel Locomotive instead?
Thanks!