5.0 volts at the generator

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Mike Zois · #16 Post by **Mike Zois** » Sat Jun 21, 2008 1:35 am

Good for you...I still think the battery is suspect. It should show more than 5 volts after being charged. Either that or the meter is reading low.

I just spent the last four hours under my replica....I adjusted the boost up over 1 bar and relocated the oil cooler to get more air flow.....testing tomorrow on my Birthday....my 12th anniversary of my 39th.....%^B.

Larry E Trimmer · #17 Post by **Larry E Trimmer** » Sat Jun 21, 2008 1:57 am

I to have a replica. 63 cabriolet Envemo made in Bazil. Love it. There is one for sale on ebay now for 22,500. great car good quality.

Checking the battery and multimeter later.

Larry

Rick Dill · #18 Post by **Rick Dill** » Sat Jun 21, 2008 2:20 am

Larry,

Let's look at the problem technically. You may (by trial and error)
solved it, but here is how these things work.

The generator should put out well over six volts to charge the battery.
It is a "DC machine" that with full excitation to the field coil should
be capable of more than anple voltage. However it may not if it is
seriously damaged (shorted turns, dirty brushes, etc.)

The voltage regulator is the thing that controls the output of the
generator by varying the excitation of the field cois of the generator.
If it is putting out a consistent five volts, then it is probably, but
not certainly, due to problems in the voltage regulator.

The battery ultimately will be charged to the output voltage provided by
the combination of the generator plus the voltage regulator and if its
output is also five volts, it will be very discharged.

The nonsense about voltmeters is just that. Old analog volt meters were
not consistently accurate and were poor for tasks like measuring
charging voltage. Any new working digital voltmeter is 10 times more
accurate than the usual old analog ones. It doesn't have to be a fluke.

Rick Dill

Larry E Trimmer wrote:

I switched out the generator with the best of the 4 and I think I have success. The generator light went out at about 1500 RPM as the old one at 2500. The car ran after I disconnected the battery so it runs under its on power.
I have not tested the output yet since its 1:30 in the morning, doubt my neigbours would care for that. I'll keep my fingers crossed and do that in the morning.

The old generator appears to have a couple of wires that look burnt due to the plastic being a little stretched. The unit I took off had a stamping as "Bosch remanufactured" and looked very new.

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Larry E Trimmer · #19 Post by **Larry E Trimmer** » Sat Jun 21, 2008 8:31 pm

Checked the voltage today and got only 6.2 volts at the battery with my multimeter. So still not enough voltage. Back to the 356 electrics book and I adjusted the voltage regulator as much as possible. Still only 6.5 volts, so I went to the cupboard found a regulator I bought from Stoddards couple years ago.
Start up and check voltage at the battery 7.3 to 7.5 at about 3000 RPM.

Seems like it was the voltage regulator. Now I get to put the old generato back in to see if it was working correctly.

Thanks to all who tried to help.

Larry