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  1. e9999

    what voltage is your alternator giving you?

    If you're wondering about parasitic drain, it is as easy as turning everything off and putting a clamp DC meter on a battery cable to measure the level of drain. Although if it's very small, inexpensive meters won't be very accurate. But then again, if it's very small, no need to worry about...
  2. e9999

    what voltage is your alternator giving you?

    ^ ^^ why are you guys sounding like it's the engine being warmed up that makes the voltage go down? Yes, there may be a small effect if the idle speed changes with warmup, but otherwise I can't see that the temperature of the engine has much to do with the voltage regulation. What am I...
  3. e9999

    what voltage is your alternator giving you?

    maybe check the voltage again under more controlled conditions like in your driveway at idle in Park or N with no load on? And if still that low, see at what rpm it kicks in? [Long shot: belt is not slipping, right?]
  4. e9999

    what voltage is your alternator giving you?

    yup, 12.3V seems too low if connected to an alternator, even at idle and with headlights on, I would think. That's pretty much what I would expect of a decently charged battery with headlights on and no alternator at all. The alternator is clearly not completely dead since it went back up at...
  5. e9999

    what voltage is your alternator giving you?

    well, it's not obvious that the A/C only draws the equivalent of 0.1V drop, cuz the regulator is likely compensating for it to some extent, but maybe not perfectly because it is limited at what it can do at idle, no idea. I keep on hoping I will see an anvil falling out of the sky someday in...
  6. e9999

    what voltage is your alternator giving you?

    Today, started with a fresh new, I think fully-charged, battery. Right after start, at idle (700rpm), no A/C, in N, was 14.3V. After 1.5 miles, 14.0V same conditions After 7 miles, 13.6 V same conditions. After that, no change. with A/C and high fan on: - 0.1V same conditions brake lights...
  7. e9999

    what voltage is your alternator giving you?

    well, I learned something today. Had to look it up. Never heard before. So now I know what "cactus" means down under. Didn't know you had any, btw. But thanks for the incentive! On a perhaps related note, I personally would take those values of "measured" CCA with quite a bit of...
  8. e9999

    what voltage is your alternator giving you?

    ^ mine never goes down to 12.6 even under heavy load. That seems low.
  9. e9999

    what voltage is your alternator giving you?

    wow, these things are really all over the place. did not expect that... but the battery is probably the main variable here, rather than the alternator.
  10. e9999

    what voltage is your alternator giving you?

    thanks for the feedback. I went and picked the newest battery off the rack and checked the voltage. 12.7V in the store. At least that part seems OK. I'm not worried about the 13.6V idle, to be clear, that seems OK, just curious about what the difference might be with what I had before...
  11. e9999

    what voltage is your alternator giving you?

    that is a very big range. Any first hand observation?
  12. e9999

    what voltage is your alternator giving you?

    So, I have in the past seen that the alternator ('03 OEM) on my earlier batteries was giving something like 14.4V right after startup, gradually going down to 13.9 V or so after a while of driving (with a dedicated voltmeter, not the dash one). This is just an impression from memory, not real...
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