Everyone,
Thanks for the advise and suggestions. I like the light bulb suggestion of CJACK's.
How about connecting each of the MTH Z's to one of MTH's Terminal blocks, plug both the Pos and neg connections into the blocks and then running a black wire to each Black Terminal on the Terminal Block/s just like you would do for a transformer that has positive and negative terminals. The reason I mention this is because the Z-500/750 does not have a 14volt Acc. Terminal.
I'd still like to hear from Barry Broskowitz or Jim Barrett on this matter, for a more diffinitive answer.
Again Thanks for all the help
Kerry