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Questions tagged [9v]

Questions related to the 9V systems used to power LEGO sets.

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25 votes
1 answer
7k views

What are the electrical properties of electric LEGO systems?

Several electric LEGO systems exist: LEGO Trains LEGO Technic Power Functions (PF) LEGO Mindstorms (in several versions) ...? How do these systems differ in electrical properties and which systems ...
Jakob's user avatar
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8 votes
1 answer
3k views

Can 10153 9V train motor be powered by the Power Functions Battery pack?

I am currently making the switch to Power Functions with my Lego Train collection and am wondering if I can power the old 9v motors that I used with the metal rails, with a battery box from the power ...
Ed Smith's user avatar
6 votes
2 answers
3k views

Electric train set not working - even though the light is on

My son just received an old LEGO 9V electric train (no model numbers or instructions) from a family member. I've set it up and turned it on. It lights up but when I put one of the trains or just the ...
Justin Kelly's user avatar