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Electronics tech Anything to do with the electronics in a model. Lights, Radio, ESC, Servo, Basic electrical.


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Old 08-14-2014, 10:27 PM
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Diesel Demond Diesel Demond is offline
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Default B-Train

So I got a b-train and im using the stock tamiya trailer light kit on both trailers. The first one plugs into the truck !!! Easy enough!!! Then the 2nd one would plug into the first trailer, but were does that power come from or how are you guys doing it???
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Flat bedders do it with chains and straps,but now im yanking 53's
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Old 08-28-2014, 11:43 PM
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Default Re: B-Train

What power supply are you using in your tractor truck? MFU or something else? The solution you need will depend on what you are using as original power/ signal supply....

Last edited by ricm; 08-28-2014 at 11:51 PM.
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Old 08-29-2014, 02:25 AM
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Default Re: B-Train

If your using a MFU the on the first trailer the second female plug will be spliced onto the light set of the first trailer and them the second light set will plug into that.

Cheers Tracy
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Old 08-29-2014, 06:46 PM
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Default Re: B-Train

A friend of mine did exactly what Tracy suggested, but found that the lights on the first trailer worked at different brightness when the second trailer was plugged in, and the lights on one trailer were brighter than the other when the trailers were connected.

The MFU is very fussy about how many LEDs it will power directly. There is another cost effective solution, using opto-couplers, but it requires some electronics know-how to design and build a small control circuit. It uses the light signals from the first trailer as switching signals to control the lights on the second trailer ,which will have an independent power supply. That way, LED brightness is always consistent and the MFU is protected.

Let me know if you need more help

Last edited by ricm; 08-29-2014 at 06:50 PM.
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