Originally posted by MikeyRa
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I've been doing some non-scientific observations on the electrical system so far, and I've noticed the following things:
1. The compressor slows slightly at idle when the car is first started, but the slowing goes away after the car is warmed up. I think this is due in part to the electrical system having to recharge the battery after burning a bunch of power on the glow plugs and starter. Just a guess, though.
2. I have no dimming of the lights at all when running the audio system hard, even at idle.
This makes me think that, even though the alt is relatively small, it seems to be keeping up okay so far. The compressor only draws like 19A running at full tilt, which really isn't that much in the grand scheme of things. Keep in mind also that even though the alternator is small, I don't have any spark plugs to power

Basically, I'm going to keep a very close eye on the electrical system, keep researching alternator upgrades, and at the first sign of needing MOAR POWAR, I'll have to come up with something.
As a dumb anecdote, while we're talking about electrical systems, the Cummins in my old truck used a grid heater instead of glow plugs, and the grid heater continues to cycle on-and-off for a few minutes after start up. That monster heater used 200A when it cycled, and you could watch your volt gauge drop down to ~10v and back to 14.4v every few seconds as it ran. I wound up having to size the wiring and fuses on the stuff I installed quite a bit higher than usual, simply due to the amperage spikes that would occur as the voltage dipped. Fun stuff.
Originally posted by Fred802
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Originally posted by skiierman
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