Is anyone familiar enough with the Delco CS130 style of alternator and its operation? I replaced the old 10Si in my Spitfire with a new CS130 style because its slightly smaller, bolts in the exact same mounting location without modifications (connector excepted, but wired the same with a warning lamp and sense lead), plus has a higher rated (105 amp) output. But the regulator operates differently or so I have read, and it that is the problem I think When the engine is first started, it shows a healthy charge (ammeter) that slowly diminishes, as any normal alt I presume should, voltage is at 14.5 volts. After a few blocks the charge indicates almost 0 (still not unusual) but at idle if the lights are on then it shows a discharge of about 6- 8 amps (now remember the old Delco 10Si would show a charge of about 2-4 amps during the same conditions) the puzzling thing is that the lights do NOT dim, and the voltage is around 13.5 volts. While driving as the RPMs increase the amps meter will go from a slight charge to a slight discharge, again without the headlights dimming or getting brighter Is this a normal charging procedure for these alternators? Voltage never drops below 13 volts. I know that the charging is Pulse Width Modulated on these but it disturbs me to drive with the ammeter in the discharge area! To me that means that the alt isnt producing enough to charge the battery AND run everything - The alternator checked out good at the local AutoZone, but I still think it suspect Wiring is unchanged from the old 10Si style, which worked just fine, its just a little bigger Any ideas cause I am running out of them and ready, reluctantly, to put the old 10Si back on?
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