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 Alternator or Voltage Regulator? 
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Firing on two.
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Joined: March 24th, 2009, 9:18 pm
Posts: 240
Location: 15340 Mourjou France
Post Alternator or Voltage Regulator?
I'd been away for a fortnight's holiday (leaving the Red Special behind) and when I got back it was reluctant to start - and it's usually absolutely immediate.

Then last night coming back from dinner with friends I thought the headlights looked dim. This morning it wouldn't start: no click from the solenoid at all. I jump started with another battery, but after that the voltage reading at the battery was a steady 10v (!). We were very lucky to get home last night it seems.....

I am currently - hah! - charging the battery. That should tell me if it's a battery problem.

How can I tell whether it's the alternator not delivering anything, or a failed voltage regulator?

If it is the voltage regulator, I'll be a bit miffed, as it is the expensive solid-state version, only about two years old, and never maltreated. After all, it's been working fine up to now.

Where do I test, and how? Suggestions welcome.

_________________
Dennis usually in the Cantal

1964 HY 72 (Type H, campervan)
1969 AZU 250 (formerly French Post Office van)
1982 Red Special
1983 Burgundy/Black Charleston
2017 Skoda Octavia Estate 1.4 DSG


August 22nd, 2021, 12:03 pm
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Firing on two.
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Joined: March 5th, 2009, 6:23 pm
Posts: 2019
Location: Near Monmouth
Post Re: Alternator or Voltage Regulator?
My 2volts…

Requires a multimeter to see voltage.
Temp hook up a 12 volt lamp to alternator Exc spade connector and the battery 12 volt.
Start the car measure the volts on the battery, if over 12 volts Alternator is functioning.

Or

Borrow a regulator to swap with yours.

Solidstate regulators are reliable for many years .

Cheers
Peter


August 22nd, 2021, 5:04 pm
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Firing on two.
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Joined: March 24th, 2009, 9:18 pm
Posts: 240
Location: 15340 Mourjou France
Post Re: Alternator or Voltage Regulator?
Peter: thanks.

Starting to check I think has shown me what the problem is. The "exc" lead on the alternator was very loose and showing signs of sparking/burning. Actually at first it was rigid, but as soon as i moved it, it became wobbly. It had maybe corroded into a set position that didn't conduct well.

I have cleaned it up and tried (not very successfully) to tighten up the connector - it's inside a fairly rigid plastic cover and not easy to bend into a more grippy shape.

With the car running I now have 14.5V at the battery, as against 13.4V when the engine is turned off.

Should I maybe think of clipping the end of the lead off and putting on a new female connector? There's not a lot of slack in the cable, though.

_________________
Dennis usually in the Cantal

1964 HY 72 (Type H, campervan)
1969 AZU 250 (formerly French Post Office van)
1982 Red Special
1983 Burgundy/Black Charleston
2017 Skoda Octavia Estate 1.4 DSG


August 22nd, 2021, 6:35 pm
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Firing on two.

Joined: June 22nd, 2014, 8:09 pm
Posts: 898
Location: Reading, Berks UK
Post Re: Alternator or Voltage Regulator?
I vote for new connector. But how annoying to have to extend the wire somewhat for such a short distance.


August 22nd, 2021, 9:16 pm
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