evilbeef54

When the 1994 in my sig is at idle the battery gauge shows just barely above the orange caution range, when measured with a volt meter the battery will start at about 12.9 and slowly start decreasing so after idle for a few minutes it will be down at 12.5 or so, measured with Datamaster at idle the voltage shows about 11.3 at idle when i slowly start opening the throttle the voltage will climb slightly to 12.1 at about 2500 rpm but when i get to 4000 rpm the voltage drops significantly to 10.8, watching the battery gauge i also see this happening, at idle it is just out of the caution range, at 2500 rpm it goes up to the middle line of the gauge but over 3500-4000 it drops down into the orange caution range. The car died and didnt want to start for my wife this week 2 times. I replaced the battery and the alternator but the problem is still ongoing, it seems to idle okay but if you drive it at all you run the risk of it just shuting off. Any ideas? I really need to get this running ASAP. Thanks guys

BTW the lower datamaster voltages also match the reading on my HSW microedge display

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I removed the ground strap from the battery and cleaned the body and strap with sandpaper, i also removed the pos wire and all the others from the battery block and cleaned all those connections, started the car back up and it was showing 13.29 volts at the battery at idle, i though i had fixed the issues but then i turned the car off and turned it back on and it was back down at 12.2 volts, i tried to turn it off and on a few times but it seems to be at 12.2 volts max at idle, the small wires that goes to the back of the alternator look to be fine as well, belt looks new and tight