The venerable Joseph Lucas Ltd. has done it to us again. The infamous 4TR regulator used on the Series V Alpine has been changed from a three (3) terminal unit (Figure 1) to a newer four (4) terminal unit (Figure 2). Both units are electrically the same as far as use in the Series V is concerned. Just reconnect wires as shown in figure 4. DO NOT connect any wires to the + terminal of the four (4) terminal unit when using this unit in a Series V. As a safety precaution be sure power is off i.e., no voltage is present at the wires to be connected to the regulator. To be sure, you should disconnect the battery.

Alpine 4TR Voltage Regulators
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I installed a new 4TR Voltage regulator today and the 4th terminal was blank so I just installed + to + , – to – , and F to F unit seems to perform OK.