1969 PA18-150 charging problem

What are the regs on installing a Denso internally regulated alternator, hundreds of planes in the USA are flying with them, $120. USD https://www.densoproducts.com/product.aspx?zpid=41542
[url]www.powerstartoem.com/021080-0760-old-denso-100211-1680/
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Careful about putting automotive alternators on. They can melt down with certain regulator failures and sling solder around. The only internally regulated alternator that I trust are the Plane-Power ones as they claim a regulator that will not run away when shorted out. That's my observation from working on aircraft and automotive systems and others will tell you different.

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B&C starts with auto alternators I thought, and rework them...

Why Plane Power and not B&C?

for the internally regulated ones, Plane-Power is the only one that claims to have wired them to prevent a runaway. They wont tell me how they do it, but I suspect they put a relay on the lead that powers the field. If that relay is opened then the field is physically disconnected from power.

Both B&C and plane power start with Nippondenso style frames. Then install their own components. Makes for a compact alternator.

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BritishCubBloke said:

http://www.bandc.aero/alternatorbossmountforpa-1819stc-pma-1.aspx

"Note: This installation applies to aircraft with previously existing electrical systems, and oil coolers mounted on the aft engine baffle only. Aircraft otherwise equipped will require field alteration and FAA approval; or modification per previously existing STC."

Says the oil cooler has to be mounted aft?! My oil cooler is in the nose bowl. Isn't that where they all are?

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They started in the nose bowl. Many have been relocated to an aft Position.
B&C is working on updating the STC with new brackets so that it can be used in the original nose bowl position. When I talked to them they was hoping to have it approved by the end of the year