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Thread: Alternator died

  1. #1
    Learner Driver
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    Alternator died

    My 100 amp alternator died after just 3800 ks.
    Is a Bosch BXH1238A a good replacement.
    Cheers
    Len

  2. #2
    Night Rider Innuendo's Avatar
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    What was the brand that died?
    The Bosch should be fine although only a 70amp alternator.
    Selling HJ 253 Engine
    Engine Number QR718*** | 19M5 Clock Casting at 6 O'Clock
    19th December 1975 Suit HJ Late Dec 1975 to April 1976

  3. #3
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    I do not know it was an ebay one that looked like an original alternator, Yes I know it's hard to believe an ebay product failed.
    Would 70 amps be enough or are there reliable bigger one's at a reasonable price.
    And I have just fitted aftermarket gauges with no alt warning light, does the alt need the warning light connected to work.
    Last edited by Len1955; 27-03-2022 at 10:20 PM.

  4. #4
    Sandman Driver maxsandman's Avatar
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    Yes, the alternator does need a warning light, the spade terminal on back of the alternator is called exciter, as it excites it to charge. You can have a bulb wired in line under the dash or under the bonnet if you don't want it in the dash, but without a bulb lighting up, the regulator won't act. A sparky could also prob put a resister in the wiring to do the same job, if you want to check that out.
    70amp alternator is fine unless you have a lot of electronic gear, stereo, heap of lights etc in the back. Most of these cars originally had 35 or 40 amp alternator unless factory a/con, & then it was 55 amp

  5. #5
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    Thanks Max I will try that, I did read on another forum that the bulb could only but 2 watts is that right
    How can I test my alt with a multi meter to see if it is OK.
    Cheers
    Last edited by Len1955; 28-03-2022 at 10:22 AM.

  6. #6
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    OK I just hooked up a T10 5 watt bulb and test ran, it's putting out 14 volts so alternator is working OK.
    Would it be OK to use a 5 watt bulb permanently.

  7. #7
    Sandman Driver maxsandman's Avatar
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    Quote Originally Posted by Len1955 View Post
    OK I just hooked up a T10 5 watt bulb and test ran, it's putting out 14 volts so alternator is working OK.
    Would it be OK to use a 5 watt bulb permanently.
    Im no expert, but i think that would be OK, just need to "load" the alternator up to tell it to charge.
    Also, I have found when using LEDs as warning lights, sometime it's not enough load for the alternator to charge, in case you were thinking of going that way

  8. #8
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    Thank's Max for the help, I have done some research and measured the resistance of the original dash bulbs and get about 13 ohms so for now I will get a resistor close to that and a diode and make up a lead to go under the bonnet, latter on I will fit an alternator led in the dash.
    The 5 watt is about 3 ohms.
    Cheers

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