Each Tiu channel is rated for 10 or 12 amps... we use 10 amp fast blow glass fuses between the ZW and each Tiu input channel.... 4 channels 4 fuses.... This has worked well over the years because we 're still using an original tiu from around 02... I like the lionel 180 power bricks better but we already have the ZWs
It'll be interesting to see what happens with the engine starting problem .. good luck.