Adding Keep Alive’s to any decoder is well documented.
The TCS KA-series of "Keep-Alive" devices is intended to be used with TCS decoders. Publicity info infers they can be used with any decoder. They must be wired internally to the decoder, not to the external wires.
The KA's have a blue wire and a black/white stripe. I purchased a KA-2. I had to email TCS, they responded with instructions on where to solder these wires inside a decoder.
The -C designation defines Keep-Alives ready to be plugged into KA ready decoders.
From: "Alan Cushing ascushing@... [WiringForDCC]"
Sent: Feb 20, 2018 10:11 PM
Subject: [WiringForDCC] Re: Converting a brass E-60 2-8-0 to DCC
Well, by converting to DCC, you have the chance to put a Keep Alive circuit in there so the loco will be capable of coasting a distance when hitting a dead spot.