Hello,
Yes, it is not ideal running a HID Kit through the stock wiring on an older vehicle. It typically will be a smaller gauge and will choke the power and and can be damaged quicker since it is already old. So you would want to run them on a HID Wire Relay. This connects the kit to your battery for power and it will only use your stock harness to trip the relay and turn the kit on/off. We have these for $5 and you only need 1 per HID Kit. Thanks