First, did you already have basic wiring in the vehicle? That one calls for a power module.If a simple converter was used, then it could cause the vehicles electrical system to be over worked.If you are getting shocked, then might be as simple as a bad ground.Also, if they used a generic spice on module, they might have probed the wrong wire. This could cause the dash lights to illuminate. If this is the case, the vehicles memory needs to be cleared. In some vehicle this could be as simple as disconnecting the negative battery cable for about 10 min. If not, then the dealer needs to clear it using a diagnostic tool.