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Then you're really looking at a full 12v conversion, or you face another set of challenges. I'm not a fan of running multiple batteries or 2 different electrical systems. It just gets a little Rube-Goldberg in IMHO (no offense to those that have done it and are enjoying it).

Simple is always better.

Doing a 12v conversion is a whole other topic that's been covered multiple times here.

I'd like to find an FM converter for the AM radio, so I might need a 6 to 12 volt converter....
Swamp cooler then..... LOL
John

"On positive ground cars, you would run a wire from the VCC+ terminal to ground (thru an inline fuse holder), and another wire from the VCC- terminal to the ACC/ON terminal on the Ignition switch. You want this "On" only when the car is running to prevent battery drain."

I am an electrically challenged person. However I have acquired all the parts that BigKev showed in his post and am getting ready to install in my 51 Packard and 55 Dodge. When reading BigKev's post It would appear that the fuse is going in the ground + wire??? I thought the fuse went into the Neg wire,( hot wire), on a pos ground system?? Am I correct? Does it make a difference? electrically challenged folks would like to know. Please use 2 syllable and smaller words.
Thanks.
Steve

it really doesn't matter what side the of the circuit the fuse goes to. On a Negative Ground car, it typically goes on the Postive feed. But really, as far as the fuse goes, it makes no different. But for the sake of commonality, attach the fuse holder between the IC module and the ignition switch.

If you are negative ground (1956+ on a Packard):

Run a wire between the chassis ground and the VCC- on the IC Module, and a wire from the VCC+ through a fuse holder, to the ACC/On position on the Ignition switch.

If you are positive ground (1955 and prior on a Packard):

Run a wire between the chassis ground and the VCC+ on the IC Module, and a wire from the VCC- through a fuse holder, to the ACC/On position on the Ignition switch.

Really the only difference is swapping the wires where they connect on the IC Module.

Basically, VCC+ always connects to whatever side is positive, and VCC- connects to whatever side is negative.

Thank you BigKev well explained and the instructions are easy to follow.
Steve