Low Speed Alternator Setup - 1971 Cadillac Hearse w/472 - Page 2
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500, 472, 425, 368 Discussion, Low Speed Alternator Setup - 1971 Cadillac Hearse w/472 in Cadillac Engine Technical Discussion; Originally Posted by BRUCE ROE From what I've heard, you don't want a single wire alternator. Without a starting circuit, ...
  1. #16
    Colonel Monk is offline Cadillac Owners Member
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    Re: Low Speed Alternator Setup - 1971 Cadillac Hearse w/472

    Quote Originally Posted by BRUCE ROE View Post
    From what I've heard, you don't want a single wire alternator. Without a starting circuit,
    you need to rev them up to get them started. If you didn't do that last time, you will be
    getting no charge current. Bruce Roe
    I think I know what you are saying, some alts need converting to one-wire and then your chassis needs to be wired to eliminate the external voltage regulator....

    Well, this one has been converted already in that the ext v regulator is gone. I believe the alt is one wire.....

  2. #17
    the APEMAN is offline Cadillac Owners Fanatic
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    Re: Low Speed Alternator Setup - 1971 Cadillac Hearse w/472

    Used to convert fleet vehicles to one wire types a while back. All new stuff wouldn't energize until the throttle was goosed. After some use the residual magnetism on the rotor would make that problem go away.

  3. #18
    BRUCE ROE is offline Cadillac Owners Fanatic
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    Re: Low Speed Alternator Setup - 1971 Cadillac Hearse w/472

    Quote Originally Posted by the APEMAN View Post
    Used to convert fleet vehicles to one wire types a while back. All new stuff wouldn't energize until the throttle was goosed. After some use the residual magnetism on the rotor would make that problem go away.
    And with the GEN light not connected, you don't even know its not putting out. I think
    1 wire alts have very little in their favor. Bruce Roe

  4. #19
    Colonel Monk is offline Cadillac Owners Member
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    Re: Low Speed Alternator Setup - 1971 Cadillac Hearse w/472

    Quote Originally Posted by BRUCE ROE View Post
    And with the GEN light not connected, you don't even know its not putting out. I think
    1 wire alts have very little in their favor. Bruce Roe
    What they have in favor is being universal...... All one needs is a charge wire and you're on the go. Our family has old wood boats, and the old external voltage regulators are failure points in that environment.

    Converting modern alts like the CS140 for use in older vehicles is another good reason - makes it very simple.

  5. #20
    BRUCE ROE is offline Cadillac Owners Fanatic
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    Re: Low Speed Alternator Setup - 1971 Cadillac Hearse w/472

    Quote Originally Posted by Colonel Monk View Post
    What they have in favor is being universal...... All one needs is a charge wire and you're on the go. Our family has old wood boats, and the old external voltage regulators are failure points in that environment. Converting modern alts like the CS140 for use in older vehicles is another good reason - makes it very simple.
    The only thing a 3 wire needs is the bulb you want, to tell if it is working. Connecting 2 small
    wires is worth the little time, to get extra performance; cleanup needs to be done anyway.

    The externa regs, yea I'd dump them (and have) in a minute. Bruce

  6. #21
    the APEMAN is offline Cadillac Owners Fanatic
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    Re: Low Speed Alternator Setup - 1971 Cadillac Hearse w/472

    The GEN lamps were not all that great. They didn't call them idiot lamps for nothing.

    One diode rectifier short would not light them while the alternator cooked itself to death. Bad diode trio sucking the life out of the battery when parked over the weekend would not light one.

    End of life brushes might light one....some.

    A voltmeter works a whole lot better provided the eyes looking at it are connected to a person who knows a few things.

    Motorheads can hear a good alternator : )

  7. #22
    BRUCE ROE is offline Cadillac Owners Fanatic
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    Re: Low Speed Alternator Setup - 1971 Cadillac Hearse w/472

    Quote Originally Posted by the APEMAN View Post
    The GEN lamps were not all that great. They didn't call them idiot lamps for nothing.

    One diode rectifier short would not light them while the alternator cooked itself to death. Bad diode trio sucking the life out of the battery when parked over the weekend would not light one.

    End of life brushes might light one....some.

    A voltmeter works a whole lot better provided the eyes looking at it are connected to a person who knows a few things.

    Motorheads can hear a good alternator : )
    The idiot light is that, but it might get you to quickly check that voltmeter. It won't find every
    fault; hardly any one thing does. But it does immediately pick up on a long list of common ones,
    keeping in mind it costs practically nothing to set up. Starting with, a broken belt. And the other
    half of the equation is the definitely superior voltage regulation of properly connecting the sense
    wire, again at practically no cost. Bruce Roe

  8. #23
    the APEMAN is offline Cadillac Owners Fanatic
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    Re: Low Speed Alternator Setup - 1971 Cadillac Hearse w/472

    One wire alternators still use regulators sampling the battery voltage. Unless there's a horrendous voltage drop between the alternator and the car B+ buss there is no advantage in having a discrete source wire. As the alternator tops voltage off the "issue" becomes tiny.

    The bulb is necessary to make the alternator charge with the factory setup. The circuit in prone to failure in many models. Considering Cadillacs have been using plastic dashboards with printed circuits well known for opening up I'll stick with the very simple and reliable one wire retrofit every time.

    Yes if a belt flys off an idiot light might wake an idiot from a stupor. How about one of those boxing glove on a lever things like in cartoons?

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