I put a 12s, single wire alternator on my Jeep. The hand-held for my EFI I can show battery voltage. I took the Jeep cluster out and put a Speed-Hut cluster in. While I had the Jeep cluster in, the hand-held was showing 12.5 volts while driving. Since I have put the Speed Hut cluster in the voltage showing is 11.5. This number stays the same no matter what the engine RPM is, from idle to 2500 plus. The alternator is wired There is a heavy gauge wire from the stud on the back of the alternator to the starter. There is a wire from the stud on the back on the alternator to the ignition switch. The plug on the side of the alternator, the red wire loops to the stud on the back of the alternator. The plug on the the side of the alternator, the white wire goes to the amp light in the cluster, I put a diode in this wire. Since I changed to the Speed Hut cluster, the white wire has been capped off at the cluster What could the issue be on the change of voltage?