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Just another modeller
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9,967 Posts
*** I'd certainly combine comments from two previous posts here - if a second hand loco is already chipped, always reset it on day 1 to eliminate anything untoward being adjusted and then do your own CV changes to your own preferences... however Zmil is right, and speed step mismatch is the primary cause of lights doing strange things almost every time. Its rare for internal contact issues to be the issue with lights.

Richard
 
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