[TR] Voltage Regulator

[David P]

Moss also has a youtube video for checking... 
https://www.youtube.com/watch?v=SxJNCigb0uA

DaveP

On 1/19/2019 5:46 AM, Randall wrote:
> I worked out a few tests, but some of them involve having a variable DC
> power supply on the bench.  (No, a battery charger will not do unless you
> have parts and know-how to build a simple variable supply from it.)
>
> With just a DMM available, I would:
>
> 1) On Ohms x1 scale, short the leads together and note the reading.
> Subtract this value (typically around 0.7 ohms) from the other readings.
>
> 1) Check resistance between terminals D and F.  Should be less than 1 ohm.
> If not, the problem is very likely burned contacts, so clean them, set the
> gaps, and try again.
>
> 2) Hold down the armature on the regulator relay (the one with the adjusting
> screw for the upper contact) and recheck resistance between D and F.  (If
> you need both hands to check the resistance, you can slip a piece of paper
> into the contacts instead of holding the armature.) Should be around 63
> ohms.  Release armature (or remove paper), check that resistance reliably
> goes back to around 0.
>
> 3) Check resistance between A and A1.  Should be very close to 0.0 (after
> subtracting the offset mentioned in step 1).
>
> 4) Set meter to highest resistance range available, check resistance between
> D and A1. Should be over 20 megohms, which exceeds the range of most meters,
> so you will see the maximum reading or sometimes "E" or similar.
>
> 5) Set meter back to x1, connect it between D and A1, then hold the cutout
> relay closed.  Resistance should drop to very close to 0.
>
> If you do have that variable DC power supply, connect it between D and E.
>
> 6) Start with voltage set below 8 volts and slowly increase it.  The cutout
> relay should move (contacts close) between 12.7 and 13.3 volts.  Continue to
> increase, the regulator relay should move (contacts open) around 16 volts.
>
> 7) Now slowly lower the voltage, the regulator should close before 14 volts
> or so (this value isn't specified in the book).  The cutout should open
> between 10 and 8.5 volts.
>
> These tests are NOT a substitute for checking the regulated voltage when
> operating with a generator (on the car); but they do functionally test each
> part of the control box.
>
> -- Randall
>
>> I have one of those old voltage regulators out of a TR3
>> sitting on my bench.  Anyone know how to test it?
>>
>>
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