No rear light w/ ERR DC Cruise Commander

Jayhawk500OGR Forum Member SUPPORTING MEMBER

As I was running my MTH SP Daylight GS4 that I upgraded to the ERR DC Cruise Commander, and everything was fine for quite a while, until I noticed that my rear light in the tenders don't light up in reverse. Neither the Aux tender or the engines tender light up. Everything (function wise) works as advertised, except the rear light. I took the engines tender apart and physically checked the bulb and got a 25 ohm reading. I then put 16 volts to the bulb and it lit up as did the AUX tender. So I'm a bit stymied as to why I lost my rear lights. All the wiring checks out. As I said, they worked in the beginning. Any help would be appreciated. Also, is the output for the light AC or DC?

Thanks

1/21/1911:41 AM

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gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

The lighting output from the ERR TMCC board is directly from the R4LC board, it's half-wave track power in command mode and full track power in conventional mode. Obviously, you treat it as AC.

What usually happens is you have a short in the light supply to frame ground and it takes out the triac on the R4LC.

1/21/1912:03 PM

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Jayhawk500OGR Forum Member SUPPORTING MEMBER

I have a spare R2LC board will that work until I can get the R4LC repaired? Also, Could you point out the Triac and the P/N so I can get one ordered from Digi-key? Thanks John.

1/21/1912:22 PM

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Jayhawk500OGR Forum Member SUPPORTING MEMBER

John,

I have the engine working with the R2LC, All functions restored. Would you be up for a repair job on my R4LC?

1/21/192:08 PM

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gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Sure, I have a bucket of those triacs, they are a common failure item. I regularly replace the smoke triacs as well, same issue. Short the line to ground, and the triac dies a quick death.