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.

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