I just finished up relocating my battery to the trunk and when I crank the car, the only thing that happens is a vibrating noise. Kind of like a dead or dying battery and the solenoid is just clicking really fast. I believe it is coming from the starter solenoid since I moved it to the back as well. I know its not my battery since I charged it completly full and tried again to get the same result. All I did was mount the battery and starter solenoid in the rear of the car. Then run the same wires that were connected to it to the trunk. Basically just made the wires longer. The only thing I can come up with is a bad ground....? here is a pic of the starter solenoid as it sits right now: All the wires on the left are connected to the wires they were orignally connected to in the engine bay. All I did was lengthen them. The single wire on the small post was also just lengthened. The large red wire on the same post as the bundle of wires is connected directly to the positive terminal on the battery. The large wire on the right is connected directly to the negative terminal on the battery. The battery is ground to one of the bolts that are holding down the battery box. The large wire that comes strait off the starter is connected directly to the negative terminal on the battery.