Re: Need in Depth Technical Help for my charging s

Posted by Bob M on December 31, 2006 at 11:20:36 from (69.205.124.61):

In Reply to: Need in Depth Technical Help for my charging syste posted by JayWalt on December 31, 2006 at 10:16:50:

JayWalt – From your description your charging system is working fine EXCEPT the voltage regulator is set too high. (You should see 7.0 – 7.5 volts across the battery posts and an ammeter reading of 5 amps or so with a fully charged battery).

My recommendation is to replace the voltage regulator with a new one. Properly adjusting a VR requires specialized equipment and is kinda fussy to get right. However if you wish to attempt to reset your existing one here’s how:

1 – Remove the regulator cover and identify the voltage regulator relay (it’s the one with the coil wound with many turns of fine wire and with it’s contacts held CLOSED by spring pressure.)

2 – With the battery fully charged, start the engine and let it run at governed RPM for 5 – 10 minutes to stabilize the battery and get the generator to operating temperature.

3 – Connect a voltmeter across the battery posts. Now gently bend the regulator relay spring hanger (or adjust the adjusting screw if provided…) to slightly REDUCE the spring pressure then check your voltage reading. Shoot for a reading of about 7.2 or 7.3 volts. TIP! Make adjustments in small increments! It takes only slight change in spring pressure will make a dramatic change in voltage.

4 – When you a finished the voltmeter should show 7.0 to 7.5 volts and the ammeter should indicate around 5 amps at full RPM.

Good luck and hope this helps!

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