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When lashing up two P3 engines, when advancing Z4000 throttle to 18V, if I don't wait 40 seconds after turning TIU & Z4000 on, both engines do an uncommanded start.  Single P3 engine no problem. Doesn't matter which TIU or Z4000 the lash up is on.  This seems to be a signal acquisition problem for P3 engines in a lashup. I'm using the updated 4.30 program.  In nearly 95% of the starts, if I wait 40 seconds everything starts okay except one lash up that is unpredictable depending on its location at time of start. Is anyone else having this problem or is it isolated to my layout?

Thanks. Moke Mike
Original Post
I found the problem and thought I'd share it. California hasn't had any rain in almost 4 years
and my outbuilding has a perimeter earth ground which is common in Northern California which does get a lot of rain.   But the drought has dried up that ground and although it isn't completely inoperable it has been compromised.  I have two copper ground rods that I use for earth ground as Lionel engines
have to have an operable earth ground. Since I was out of other troubleshooting options I poured 20 gallons of water down each ground rod and the problem has been fixed.  Each earth ground rod connects directly to my earth ground in my service panel.  Proto 3 lash ups now work correctly and all lights on both engines also work correctly.

Moke Mike

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