Posted by Bob M on June 20, 2008 at 07:48:12 from (151.190.254.108):
In Reply to: Re: super c VR issues posted by mazemeister on June 20, 2008 at 07:05:26:
Hey Maze... VR’s are supposed to come properly set right out of the box! (Adjusting correctly requires instruments/tools/training not commonly available to the average tractor mechanic)
After installing a new regulator you can verify adjustment by placing an accurate DC voltmeter across the battery posts. With the engine running at max idle RPM it should read 7.0 – 7.5 volts. Less than 7 volts means the VR is out of adjustment.
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You can reset regulator voltage but it’s a fussy adjustment: Again place an accurate DC voltmeter across the battery and run the engine at governed RPM. If voltage is not between 7.0 and 7.5 volts VERY CAREFULLY bend the spring anchor on the voltage regulator relay - the relay whose contacts are held SHUT by spring pressure.
Increasing spring tension increases voltage. But the adjustment is quite sensitive - doesn’t take much change in tension to make a significant change in voltage. Also after making any change put the cover back on and read the voltmeter again – voltage frequently changes when the VR cover is in place.
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Regarding the cutout operation, it’s normal for the ammeter to read a couple amps discharge at idle (it’s indicating the current being drawn by the ignition coil). Also it takes a brief current reversal of 3 - 5 amps to “unlatch” the cutout relay when gen voltage drops below battery voltage. You can observe this when you shut down the engine – the ammeter will briefly flick to about -5 amps then swing back to 0 as the engine spins down. This is completely normal.
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One final thought: Your SC isn’t perhaps fitted with an 8 volt battery? (Battery has 4 filler caps). If per chance it is a 6 volt regulator – even properly adjusted and working – will give charging problems exactly as you describe.
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