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Power Strokes
6.0 Tech
Voltage drop and idle speed drop during warm up
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[QUOTE="robrike1, post: 1549632, member: 33184"] I've had very little time to deal with knocking this issue out but what I have found so far is that my frame to body ground strap was green and both eyelets snapped off while unbolting it to replace with a cable. I had tried running a battery jumper cable from the passenger negative post to the frame and at that time after starting the surging wasnt quite as bad but was still fairly noticeable once everything stabilized which takes 4 to 5 minutes before idle quits dropping in unison with voltage dropping and rising. I'm assuming glow plugs cycling longer than they should. Once the cycling stopped I measure voltage at battery and alternator and never got higher than 13.1 volts from alternator post of either battery as alternator was charging. Today I replaced the cable that was corroded and also undid the passenger negative to engine connection and cleaned it with wire wheel and coated in di-electric grease and reinstalled. Did not get to either frame ground yet. I didn't get to drive it as I am at work and won't get off till tomorrow morning. I would think after a cold start once the alternator kicked into action to charge I should see voltages higher than 13.1. I even tried 2 different voltmeter just to be certain. I'll clean those frame grounds off the 2 battery negative terminals and see where I'm running but I have a feeling a new alternator is coming. Never get a battery light and it does work with KO-EOFF. I'll post more when I have those other grounds cleaned up. If anyone thinks my alternator is on the way out based on lack of 14+ volts from alternator post I'd love to here from you. The 13.1 volts was with my engine steady at 1250 rpm also. Thanks, Robert Sent from my SM-G955U using Tapatalk [/QUOTE]
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Voltage drop and idle speed drop during warm up
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