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Old 07-15-2020, 01:26 PM   #1
1931 flamingo
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Default Elec novice

40 coupe w/48 block. I had the gen rebuilt last year. Rechecked again a few weeks ago along with the regulator. Dash gauge comes up slowly mid way and then into the yellow, then to green. Batt shows 6.3 volts.
Where on the regulator do I measure voltage.
As always Thanks in advance.
Paul in CT
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Old 07-15-2020, 02:05 PM   #2
51 MERC-CT
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Default Re: Elec novice

From one novice to another, I would check from 'A' to ground going into the regulator and from 'B' to ground coming out of the regulator.
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Old 07-15-2020, 02:14 PM   #3
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Default Re: Elec novice

I’m just a hack but I check voltage at the battery before I start then recheck after the car is running to compare readings
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Old 07-17-2020, 01:20 PM   #4
1931 flamingo
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Default Re: Elec novice

OK, nothing at A or B. Also nothing (maybe o.3 or so) on each post of the gen. Gen and regulator just checked. Any ideas?? Have had it running and batt shows 6.2-6.3V, still pos ground.
Paul inn CT
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Old 07-17-2020, 02:14 PM   #5
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Default Re: Elec novice

Quote:
Originally Posted by 1931 flamingo View Post
OK, nothing at A or B. Also nothing (maybe o.3 or so) on each post of the gen. Gen and regulator just checked. Any ideas?? Have had it running and batt shows 6.2-6.3V, still pos ground.
Paul inn CT


Paul not sure taking readings on the regulator is the way to go. Heres what I do to test for output using your meter first take a reading at the battery before you start the engine note the reading. Then start the engine and take another reading obviously you want to see a higher voltage reading with the engine running if you see an increase in voltage write that down. Now if you did see a higher reading in the previous step now turn the head lights on this will add load to the charging system which if working correctly should carry the added load of the lights being on. This means the reading at the battery with the car running and lights on the reading should be above 6 volts.
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Old 07-17-2020, 02:38 PM   #6
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Default Re: Elec novice

Looking at the wiring diagram the B terminal on the regulator should have battery voltage even with the engine off.
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Old 07-17-2020, 04:39 PM   #7
1931 flamingo
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Default Re: Elec novice

Ronnie and Bob C: WIl try this tomorrow. Dash voltage meter still only goes to a little past the red zone into the yellow..
Paul in CT
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Old 07-17-2020, 07:13 PM   #8
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Default Re: Elec novice

Not running a fully charged battery should read in the 6.3 - 6.4 volt range and the B terminal on the voltage regulator should read the same as the battery minus any voltage loss in the wiring. Running (with the rpms up) the battery should be seeing 7+ volts, but this is somewhat dependent on the system load (light on, etc).
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Old 07-18-2020, 06:32 AM   #9
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Default Re: Elec novice

Batt terminal - to regulator case+ engine RPM need to be increased to see full generator output. Use an analog meter 7.0 to 7.7 v is good but 7.2 to 7.5 is better.
First with engine off turn on country headlamp beam for one to two minutes then measure battery voltage at the regulator with headlights off should be 6.25 to 6.6V if not recharge the battery first. Then run engine at medium speed and with engine and regulator warm measure the highest voltage. You can see it is important your voltmeter is accurate.
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