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rlwiley
04-18-2010, 08:05 AM
Just picked up an 82 SNS with fresh engine. Took alternator off and it tests good There is a small black box mounted to the back of the alternator that has wires going to the stator, field, ground, and battery posts of the alternator. The only wire coming off the alt is the battery. There are 3 wires located directly behind the alt that have the rubber boots but are not connected to anything. Traced them to back of motor and are not connected on other end either. Is that black box the voltage reg? Anyone have a pic or diagram of wiring?

ski_king
04-18-2010, 08:35 AM
Try This (http://web.archive.org/web/20020310082943/www.skiboathelp.com/tech/colorcode.html) it shows a brown, green and black wire voltage regulator.
http://web.archive.org/web/20020310082943/http://www.skiboathelp.com/images/pcm_wiring.jpg

JimN
04-18-2010, 09:31 AM
Just picked up an 82 SNS with fresh engine. Took alternator off and it tests good There is a small black box mounted to the back of the alternator that has wires going to the stator, field, ground, and battery posts of the alternator. The only wire coming off the alt is the battery. There are 3 wires located directly behind the alt that have the rubber boots but are not connected to anything. Traced them to back of motor and are not connected on other end either. Is that black box the voltage reg? Anyone have a pic or diagram of wiring?

Are you asking if it needs another wire to the boat harness? Probably not- one-wire alternators were common and use the one cable as the charging lead and to excite the field once it starts rotating.

rlwiley
04-18-2010, 10:39 AM
Thanks, that helps a bunch. What terminal on the regulator does the purple wire land?

JimN
04-18-2010, 11:41 AM
Thanks, that helps a bunch. What terminal on the regulator does the purple wire land?

Can you post a photo of the back of your alternator? If it's a one-wire unit, the purple wire isn't needed and should be taped off/tied out of the way. If the alternator is OEM, look for a post that's labeled 'EXC'.