Hitachi Voltage Regulator help

1962-1965 Datsun L320 and NL320 forums - The truck that started it all in the US. All 320-specific topics and discussion can be found here.
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Li'l Truckie
Posts: 558
Joined: Thu Jan 02, 2014 9:28 am
Car: 3 x '65 PL 320
1 x '64 PL 320
1 x '63 PL 320
1 x '62 PL 320 - parts :(
1 x '60 PLG-222
and many more Datsuns from 48hp to over 500hp
Location: Leavenworth, KS

Hitachi Voltage Regulator help

Postby Li'l Truckie » Sat Jun 28, 2014 9:45 am

Hey folks,

Looking for help with the Hitachi voltage regulator. Big question first -

How do you know if it's working correctly? Beyond the "its not charging the battery"

Yes, the generator has been tested and works correctly.
Yes, all wires are correct and I compared them to the two '65 - same, same chicken.

Image

What should the resistance/Ohm readings be for the different post - A, F, and B?

Has anyone rebuilt the OE Hitachi Voltage Regulator with new capacitors?

Heading out now to swap out a known working voltage regulator from one the '65s to put in the '64, Shroom-ster.

stay cool, its getting hot out.

Li'l Truckie


Gemmer
Posts: 86
Joined: Mon Jan 27, 2014 5:38 pm
Car: 1964 Datsun PU 320
Location: Roseville,Ca

Re: Hitachi Voltage Regulator help

Postby Gemmer » Sat Jun 28, 2014 12:06 pm

Truckie,
I noticed a trouble shooting guide for the voltage regulator starting on page 162 of the service manual. Don't know if this can help.
Gemmer

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Li'l Truckie
Posts: 558
Joined: Thu Jan 02, 2014 9:28 am
Car: 3 x '65 PL 320
1 x '64 PL 320
1 x '63 PL 320
1 x '62 PL 320 - parts :(
1 x '60 PLG-222
and many more Datsuns from 48hp to over 500hp
Location: Leavenworth, KS

Re: Hitachi Voltage Regulator help

Postby Li'l Truckie » Sat Jun 28, 2014 1:51 pm

Gemmer,

I read through that a couple of times, but it really doesn't help much. It focused more on the generator charging and then adjusting the VR which I'm leaving alone, per the manual.

I changed out the VR from Li'l Red and the light still comes on. It's starting to storm, so I change out the generator tomorrow. There's a good car/farm equipment electric shop in Olathe, KS so I'll stop by and drop of my stuff prior to class and let them look at all of it.

Andy

Gemmer
Posts: 86
Joined: Mon Jan 27, 2014 5:38 pm
Car: 1964 Datsun PU 320
Location: Roseville,Ca

Re: Hitachi Voltage Regulator help

Postby Gemmer » Sat Jun 28, 2014 3:03 pm

Truckie,
I kinda thought you had probably checked the manual out. If you switched out VR's and still can't show a charge, then it seems as though it has to be the generator or the gauge.Think the electric shop is a good way to go. Hopefully they can find the problem for you.
Gemmer

User avatar
Li'l Truckie
Posts: 558
Joined: Thu Jan 02, 2014 9:28 am
Car: 3 x '65 PL 320
1 x '64 PL 320
1 x '63 PL 320
1 x '62 PL 320 - parts :(
1 x '60 PLG-222
and many more Datsuns from 48hp to over 500hp
Location: Leavenworth, KS

Re: Hitachi Voltage Regulator help

Postby Li'l Truckie » Sat Jun 28, 2014 7:59 pm

Yeah, so much for having a "good" generator. Hitachi voltage regulator #4 was the same so I'll swap in/out the generator tomorrow.

On the two '65s the generator produced the 6-8 amps and the battery showed a constant 11 volts regardless of the engine rpms. On the Shroom the generator fluctuated between 5-7, so the generator should be good, but the battery volts followed the rpms as the motor was revved, therefore the VR is not working. So that my reasoning for a bad voltage regulator.

So kind of at a loss and the reasoning for swapping everything out on the Shroom. Once I verified all the good parts (battery, generator, and VR) all work on Shroom, I'll put everything back on the '65 and swap each part in on the '65 and see what happens. Lots of work, but somehow have to narrow the fault down on the Shroom and make sure its not something else as there really isn't anything else.

Truckie


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