Most of the older BX's (pre 2006) came std w/a Dynamo whereas later model BX's (2006 and above) come w/an alternator. Knowing which device you have will determine how much of an electrical load your BX can operate and still maintain a proper charge on the battery.
The Dynamo is easily distinguishable from the alternator. it is much smaller and has a solid body without any cooling vents. It is a form of alternator but it is less robust. It is rated to put out approx 14 - 15 amps at full governed engine speed.
Like the bigger alternator, it produces an alternating currrent (AC) which is both rectified and regulated by an external voltage regulator mounted under the dash.
Since it only developes 15 amps max, there isn't much extra current left to power many add-on electrical accessories.
Basically, you can add a single 55 watt work light or two 35 watt work lights and still maintain enough current to properly operate the tractors electrics and recharge the battery. Any more load and you'll end up having to use a battery charger to keep the battery up.

The alternator is rated at 40 amps at full governed engine speed and is similar to a std modern automotive alternator but smaller.
If you plan on adding many additonal electrical loads to your BX such as 3 or more lights, a flasher, radio or even power a sprayer etc., the alternator should power these additonal loads with power to spare to keep the battery recharged.

Just remember to use Ohms Law to deternine the load you plan to add to ensure your charging system wil lhandle it and you should be fine.
W = A * V (W=watts, A= current, V= volts)
Dynamo, 12v * 15a = 180 Watts max output.
Alternator, 12v * 40a = 480 Watts max output.

Good luck

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