Vehicle parts: Thunderstrike Charger & Tesla Coil.
In the top of your vehicle exists a lightning spike able to be grounded via a lightning safety line.
Via consumption of battery power you can generate an extremely positive electric field that will draw lightinings to your vehicle during stormy/rainy skies. These will be harmlessly grounded via the safety line. (deployed automatically before use)
Connecting a second line with the safety line from the spike and via a very heavy duty capacitor to the ground will result in the capacitor also charging when a lightining strike happens. With each strike the capacitor may be damaged, and trying to charge an already damaged capacitor will result in catastrophic explosion.
The million volt charge can be used via a coil to fry anything smaller than a hulk at distances up to 10m, but is usable only once before the capacitor needs to recharge.
The capacitor is so massive (500kg) that can only be used mounted on a vehicle, but the coil is portable. One can either mount it too, or connect it to the vehicle via an HD cable and use it as a weapon in hand. Such use will unfortunately fry the HD cable during use, also reducing the weapons effectiveness.