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Jun 15, 2022 11:44:39 GMT
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15.2 is on the high side, 14.7 is normal. What are you measuring the voltage with ? A Crypton 335 Motorscope. I presume it's getting the voltage from the battery connections - I must admit I'm following through the test procedure in the manual and trusting that if I have the correct buttons pressed, it's showing me the appropriate figures. This is in the section I'm looking at. The trace remains similar to my photo in the top post, but I suspect that's more down to a problem with the display on the Crypton scope that I haven't had chance to look at.
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Last Edit: Jun 15, 2022 11:45:06 GMT by droopsnoot
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jimi
Club Retro Rides Member
Posts: 1,815
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Jun 15, 2022 15:39:40 GMT
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I was more wondering about the accuracy of the test instrument, your Crypton isn't exactly a spring chicken, I wonder when it was last calibrated (if ever) ? Might be worth checking it against a good DMM if you have one (or can borrow one) At work our test instruments are checked for calibration & certified every year (against a NAMAS standard by an outside calibration company)
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Black is not a colour ! .... Its the absence of colour
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Jun 15, 2022 17:10:06 GMT
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That's a fair point, I certainly wouldn't like to use it to distinguish between 14.5v and 14.6v - in fact at idle it will fluctuate between 14.5 and 14.7 which I just put down to stuff that I shouldn't worry about, and I suspect that the scope trace issue is more with the machine than the alternator. As for calibration, I'd guess it's more like decades than years.
It is the case, though, that when the warning light is showing faintly, the battery gauge on the dash is also dropping, so there is (or was, when I was on the old alternator) an issue somewhere. If it persists, I imagine I should be looking elsewhere as it's unlikely that two separate alternators would show the same intermittent fault.
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Last Edit: Jun 15, 2022 17:10:57 GMT by droopsnoot
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Jan 11, 2023 13:09:22 GMT
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I sorted this problem out. More recently I started the car and the light came on full brightness after a few minutes, so when I was at the NEC Classic Car Show in November and saw someone selling new 18ACR alternators for £45 I bought one and fitted it to the car. All it needed was one wire to be disconnected, and it's fine now.
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