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Thread: Car chugging

  1. #11
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    Quote Originally Posted by Bitsyncmaster View Post
    I think because of the constant loads in new cars, all manufactures have increased the typical alternator voltage to 14.5 volts to get the batteries charged faster.
    My original Motorola does ~14.3. I had understood this to be the normal DeLorean range.

  2. #12
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    Join Date:  Dec 2018

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    This thread got me thinking. In all the years of working on cars I have probably put a multi-meter on hundreds, if not a thousand cars. I can only remember a handful of them reading over 14 volts. Today, I just happen to have eight, 12 volt vehicals at my house, so for fun I went and metered them all. All were started and ran for a few minutes and everything inside was shut off. (Lights, AC, etc.)

    Here's the results:

    1990 Ford Bronco-13.98
    2004 PT Cruiser-13.65
    1981 Delorean-13.78
    1974 VW Bug-13.70
    2016 Corvette-14.42
    2016 Chevy pickup-14.56
    2000ish Custom truck-13.86
    2004 New Holland tractor-14.45

    So there you have it. It would appear that these numbers confirm Bitsynmaster is correct about newer cars having slightly higher voltage. (Did we ever doubt him?)

    One thing I thought about later. Probably most of the cars that I stuck probes on were having trouble. Lol.

  3. #13
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    Quote Originally Posted by Bitsyncmaster View Post
    I think because of the constant loads in new cars, all manufactures have increased the typical alternator voltage to 14.5 volts to get the batteries charged faster.
    Yeah, they have kept raising it over the years. The replacement regulators for rebuilders were mostly 14.2V regulators for decades (esp. GM)...we bought them by the 100s. But now, the ECU is in control instead. It sends a PWM (for duty cycle), E.G., a C6 Corvette:
    Commanded Duty Cycle
    Generator Output Voltage
    10%-11.00V
    20%-11.56 V
    30%-12.12 V
    40%-12.68 V
    50%-13.25 V
    60%-13.81 V
    70%-14.37 V
    80%-14.94 V
    90%-15.50 V

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