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Making the Bosch (and Wehrle) Metal Can Electronic
Voltage Regulators Adjustable.
>>A HOW-TO article<<

© Copyright, 2012, R. Fleischer

I wrote this article because a few people asked for it. You can purchase an adjustable voltage regulator quite reasonably from or But, the stock metal can regulators are not difficult to modify, the cost is very low, and you get to keep the original stock appearance ...if you want-to. The metal-can VR's are very reliable ....and are relatively easy to repair. They can even be modified to work with very high powered alternators for the Airheads (by changing the power transistor inside).

The BOSCH and Wehrle METAL CAN Electronic Regulators ARE relatively easy to modify, so, go ahead if you wish-to. YES, there are metal can regulators that have a Wehrle label on top, the one I have seen is stamped with a model E 1051 B/14V, made in Germany. These regulators have a similar circuit to the Bosch regulator which is what the following procedure is specifically for, although applicable to the Wehrle. This Wehrle metal can regulator has the same sort of circuitry & adjustment control inside. These regulators, no matter the name on them, MIGHT have been made by Bosch or Wehrle.

The exact same procedure is involved....(and the same hole drilling and adding a grommet, IF YOU WANT TO) etc. Here is a photo of the Wehrle METAL CAN Electronic Regulator, with the potentiometer, with factory sealing paint. The pot is identified by a red line & arrow:  

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