70 S, RHD, Signal Orange, UK->Australia->UK

[coomo]

£5,223 doesn't seem too bad. I haven't seen the car but seems like good value to me.

if only......

[inaglasshouse]

If you want to know what a fried battery (sealed gel matrix variant) looks like, check out the bulge in the case:



Like a balloon!

I think I will count that one as a lucky escape. I don't think it would have been a good scene in the luggage compartment, had it let go...

[Lightweight_911]

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I had a similar experience in my 904 replica when a faulty voltage regulator allowed the alternator to overcharge - cooking the Odyssey PC 968 battery & 'frying' the twin MSD spark boxes ...

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[Jonny Hart]

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I had a similar experience in my 904 replica when a faulty voltage regulator allowed the alternator to overcharge - cooking the Odyssey PC 968 battery & 'frying' the twin MSD spark boxes ...

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This was a good real world test for the over-voltage protection in our CDI+ units.

No frying for Mr Fry’s CDI!

[inaglasshouse]

This was a good real world test for the over-voltage protection in our CDI+ units.
No frying for Mr Fry’s CDI!

Happy to be of service...
Confirmed, no damage to CDI+. Or anything else, in fact, with the exception of some blown headlight bulbs.
Phew.

[911GP]

Hi Richard - Do you know what caused it? Was it the voltage regulator or something else?

[stretch]

What he said... i have a similar issue.

[inaglasshouse]

Alternator and regulator both went for test. Both faulty. I ended the investigation there and bought the uprated alternator (which has the regulator built in).

[IanM]

Alternator and regulator both went for test. Both faulty. I ended the investigation there

What brand was the original alternator? Bosch or Motorola Marchal?

[inaglasshouse]

Motorola Marchal. Probably the original from the car, since that would be period correct.

[IanM]

So, the Bosch would not be period correct?

The PET catalogue lists both brands, so it is confusing.

[Lightweight_911]

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There were at least 3 different makes fitted to early 911's - Bosch, SEV-Marchal & Motorola ...

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[inaglasshouse]

I did, once upon a time, have info about which was likely fitted in each year. Probably from early s, they like that sort of thing...

For my 70 car I looked at a ton of early 70 reference pics and they all used the Motorola regulator (regulator is specific to the alternator, and easily identified in a decent engine bay photo).

[IanM]

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There were at least 3 different makes fitted to early 911's - Bosch, SEV-Marchal & Motorola ...

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According to the PET catalogue, the SEV-Marchal and Motorola are one and the same, isn't it?

Why were there 2 different alternator brands? Year specific? Country specific?

Which of the two had better reliability and longevity?

[Lightweight_911]

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Yes, I think that the SEV-Marchal & Motorola alternators are effectively the same part - I seem to remember that the branding depended on the destination ... Motorola was supplied to the US & SEV-Marchal to ROW markets.

I don't know if there was any logic to whether a particular model got a Bosch or SEV-Marchal/Motorola alternator - both brands are listed for '69-'73 models according to the Factory's Technical Specifications booklets ...

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