2001 W900. Voltage will drop down to 11-12 volts at same time amp gauge will jump up to about 60-70 amps, only for a few seconds. then the amp gauge will return but sit a little to the negative side say 5 amps. Voltage remains the same most of the time, sometimes it will go up to about 13-14 volts. Mostly happens at night when running lights etc., but have seen it during the day. New batteries, alternator about 3 months old. Had alternator tested yesterday putting out 160 amps, which is what it is rated for. Mechanic at kenworth dealer said bad ground or bad wire on battery? Any suggestions on what to start checking?
Electrical problem
Discussion in 'Kenworth Forum' started by cumminsISB, Dec 19, 2014.
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also, does anyone know what all the boxes and such are in the battery box? Wires running to them towards the front of box?
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Voltage regulator?
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alternator has internal regulator, tested good.
Big Don Thanks this. -
Sometimes the alternator cables get corroded or bad ground between starter and chassis or starter to batteries but there is no way to really measure I know these cables have major problems on Freightliner but don't know bout kw check connections make sure everything is tight
cumminsISB Thanks this. -
my problem was brand new batteries and not all the connections got tightened down.
one of a few things to check.cumminsISB Thanks this. -
I'd inspect positive cables carefully almost sounds like a live wire grounding out
cumminsISB Thanks this. -
To me it sounds like it's briefly overcharging. The tele-tale is that the gage is showing negative after the overcharge.
cumminsISB Thanks this. -
cumminsISB Thanks this.
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may carry it to an electrical place to have tested. Kenworth tested it Thursday.
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