> > Now, no. No reason not to go with a high-capacity 12-volt
>> battery. Or do what I did when I first had my Diesel - two
>> 12-volt batteries in parallel. You wanna talk amp-hours....<grin>
>
>Urrghh...
>
>Speaking of batteries and other volt related gizmos...
>
>I've got two batteries. One is under the bonnet in the standard spot. The
>other is in the spare well in the rear tub. They are in parallel for mucho
>CCA, tied together by -2/0 welding cable. Between the winch, the lights, the
>stereo (two smallish amplifiers and a CD player) and the twin heater motors,
>there is quite a lot of draw.
>
>This is the problem. The alternator doesn't put out enough amps to keep
>everything happy if I'm not driving at speed (2500 rpms). When everything is
>on and I am idling, I can see the lights dim, and as soon as I hit the gas
>everything is happy. Trying to use the winch and the off-road lights at the
>same time causes a major voltage drop.
>
>So, I have to "build" a larger alternator, or boost the output of the
>current one. it is a delco 63 amp alternator from an 81 delta 88 or
>something. I've seen the 100 amp+ rebuild kits that boost the output of a
>Delco alternator. What I'm worried about is reliability. It seems that
>almost doubling the alternators' output might be a tad hard on the thing.
>I've heard that these alternators aren't as durable as the lower output
>ones. Should I be worried? I've seen Delco marine alternators rated for 130
J-L, consider getting a 12SI alternator. It's physically the same
size as the 10SI. It's got a more efficent fan (centrifugal, instead
of blades) and a bigger air vent on the back of the case. The big
plus is that it's available as a 94 A package. I've got a delco
number of 321-266; but I don't know what the application for that
number is. GM used the 12SI from about 83 to 88. I'd suspect the
high-output was used on full-sized things with heavy-duty options
(think police package caprices, caddies, high-performance
camaros...). The pulley from a 10Si will fit a 12Si, if you've got a
strange setup (or get one from a junkyard that doesn't match).
I don't know how fast your engine revs, but if it's not too high, a
smaller alternator pulley or larger crank pulley will speed the
alternator up, resulting at higher output at idle.
David
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