Alternator Conversion Kit

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June 1st, 2007 admin Leave a comment Go to comments

Alternator Conversion Kit

470 Mercruiser - Low Charging below 13.5 volts?

I have a 1982/83 Mercruiser 470. At present, when I run her, she is not charging at 13.5, it starts below 12 then builds up to 13. Is this a problem that needs to be be addressed asap? Also what could be causing this and how can I test or diagnose the problem.

If the Stator or Voltage Regulator is going bad, should they be replaced or should I consider going to a Alternator Conversion Kit, which I saw is now available for the 470. I think the kit with brackets could run around $450ish.

Also, looking at the connections on the Voltage Regulator, the wires have a little corrosion on them. Should I take apart all the connections, clean them and re-connect them or is this problem usually something else, ie..bad part?

Little history, I replaced the Voltage Regulator about 12 to 15 years ago, but never the Stator. A recent problem had Coolant leaking down the Engine and over the Voltage Regulator.

Thank you

If I am not mistaken, the 470 runs a water cooled regulator mounted to the side of the engine and the stator is at the front of the crankshaft under the rotor/harmonic balancer.

If this is the setup, it is pretty straight forward.

The two stator leads run from the stator to the regulator (yellow/red stripe). Test each of them with an ohm meter, + lead on one yellow/red stripe & - lead on output terminal of regulator (orange), same on the second yellow/red stripe. both Should show continuity as tested & be open (no continuity) with the test leads reversed (- test lead on yell/red stripe & + test lead on orange. The orange or red/white stripe is the output wire,
red is the sense wire.

The red sense wire runs straight to your starter solenoid & connects with the + batt lead, the orange or red/wht stripe runs up through the ammeter and back to join the red & shares the connection on the solenoid with the red battery lead & the sense wire. check to make sure these wires are making good contact at the connections and check the ground wire too.

The water cooled regulators are not the most reliable and they are not cheap either. If the regulator is bad, it may be in your best interest to do the conversion as a couple of failed regulators could cost as much or more.

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