TPC - Do they go bad?

Anything electronic can go bad, but have you checked the voltage into the TPC? It's more likely that the level has changed.

I agree with RoyBoy, the TPC will drop about .6-.7 volts from the input.

Thanks guys, I have 2 180w bricks going into these so I will go down and check their voltage.

Regardless of the cause, 16.5 volts is plenty to run TMCC/Legacy stuff on. I wouldn't waste money replacing it. If it goes down to single digit voltage then you've got a definite problem.

I've noticed voltage fluctuations on my layout depending on the time of year. Usually during mid summer when everyone has their A/C cranked I might lose a volt.

Having said all that, Ive run TMCC stuff as low as 14vor 15volts coming out of the TPC unit to minimize the arcing two parrallel bricks create during a derailment.

I've long since sold off one brick, and just use one at full voltage. Its 17.6v on the input side of the TPC unit.

Roger,

   You might want to check your voltage directly at the tracks to see what the actual delivered voltage really happens to be.  I use the small clamp type Volt Meter from Harbor Freight, to check actual track voltage every once in a while, as Rick O points out it can vary at different times of the year, sometimes more than you might think.

PCRR/Dave

According to Mike Reagan, for good smoke output, you need 17-18 Volts on the Track!

Fred

For many locomotives, you also need good voltage to fire the electrocouplers.