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Hi all, I have been having an issue for the past few months with high voltage from the alternator. The boat has a sterling alternator to battery regulator and this had a warning light on for high alternator volts, so I measured the voltage it was putting out at the batteries and it is 14.75 which I believe is too high. I was advised it would be the voltage regulator on the alternator that had failed and so have had a new alternator fitter by RCR as it is covered by their parts replacement, however after the engineer left the warning light came back on and it was back to overcharging again. RCR came back, fitted another new alternator, still over volts, tested all wiring and connections, all were fine even wired the alternator direct to the batteries cutting out the sterling alternator controller and it was still high voltage and so they said they couldn't help anymore as it would require deeper investigation. They arranged another engineer to come out and investigate further, he has checked the alternator and confirmed it as fine, checked all the batteries and confirmed they are fine, check all connections and they are fine. He believes it must be the sterling alternator controller that is causing the issue but did not attempt to disconnect it or tell me what I would need to buy to replace it which is what I want doing as I just want it fixed. I am not 100% convinced this has failed as the unit has a unit fail warning light that is supposed to come on if it has failed and should shut down if it does fail which has not happened, and the original RCR bloke wired the alternator direct to the battery and it was giving out high volts. I need to find an electrical engineer in the midlands who could come out and strip out the sterling controller and replace it with a new one or a split charge system of some sort, I cannot take the boat to a boat yard as I do not want to run the engine as it will damage the batteries and there is nothing in our marina, does anyone know of someone who will be able to come out and not just check what needs doing bet also replace anything that needs it?