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Hi All, I'm after a little advise about my replacement alternator, Pestolite 66021590M, which I have fitted. It is replacing the original 900021-als with is a Lucas a127 70amp which was teamed up with Sterling Advanced Regulator ( the blue one). This is a photo of the old alternator in situ. Looking at the HMI diagram (attached) the old alternator doesn't have a negative connection, so assuming the case was the negative. On installing the new alternator I connected the Black & Yellow cable (D+) which connects to the Aux Light on the control panel and the battery plus (B+). Turning the ignition to the on position the the 'Aux Alternator Charge Light' on the control panel did not illuminate as it normally would so I touched a cable between the battery negative (B-) and the engine casing, instantly the light illuminated indicating to me that i need the negative connection. The next test was to briefly turn the engine over and jump between the B- and the engine casing. No output from the alternator until the jump was made which shot up to 88 Amps and the engine tone changed to indicate a load. Using a bit of 6mm cable I connected the B- to the negative on my batteries using ring connections, I turned the engine over, keeping an eye on the cable temperature, the charge rate was significantly lower about and Amp (forgot to write it down) and with the inverter running the batteries we discharging. The batteries were almost fully charged (~98%) but I would have expected with the inverter & TV one the the charge would have been positive. What am I missing or doing wrong? Also, I am unsure what the negative cable should be, is it just completing the circuit or is it taking a heavy load therefore needing a heavy duty cable? Any views / suggestions / ideas / pointing out my mistakes would be great, Thank you, Scott
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