LS - 4th Gen (2007-2017) Discussion topics related to the current flagship models LS460, LS460L and LS600H

Odd Electrical Problem

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Old 11-15-23, 10:51 PM
  #16  
Marc780
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Originally Posted by Cape600L
Had to drive the car for a short distance today and now I have the following. This is in addition to the other issues from saturday/sunday. I did not have time to scan it today. Hoping this is all pointing in a direction. Thinking I want to monitor "live" info for alternator voltage/operation.
Check VSC
Check Electronic parking brake
Check ABS.
Still have the Check brake system and SRS/airbag .
Today radio was on. Radio went off after 5 min of driving and then a few seconds later the Christmas tree of warning lights and dash warnings started happening. Tried to set the cruise and the light in cluster would just flash. Car drove fine. I HATE electrical issues!! Will scan tomorrow and see if there is anything different than Sunday scan that I posted above.
The last time I saw such an intermittent electrical issue on a car was on my Dad's old Dodge truck. We checked things for hours and finally brought it in to a shop. The mechanic sat in the drivers seat, poked a couple things with his scanner probes, then just thought for a minute. Finally he just nudged the ignition switch on the steering column, by turning it just the tiniest bit, and the problem (bad idle and no dash lights) instantly vanished. Then he moved it back again, and the problem came back. Move it back to the good spot, problem gone. Etc. He changed the ignition switch that turned out to be just worn a little too much and that did the trick.
I don't know if it might be the ignition switch, one of the fuse boxes, or somewhere else that might have a bad connection, but I'd suspect every component that carries voltage for more than one function/multiple different functions. It might be something as simple as a bad ground connection in the wiring someplace.
Old 11-16-23, 01:41 PM
  #17  
Cape600L
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Update-Alternator arrived, installed today. What a PIA! Took for a 20 min drive while monitoring voltage on a graphed scanner. Stayed consistent at 13.5-13.8. Had high of 14.1 and low of 13.4 in that drive. Nothing funky happened, but time will tell. FYI, the alternator on an AWD car only has 3 attachment bolts. There is a large crossmember under the alternator so all work has to be done from above as opposed to a non AWD version.
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Boykie (11-16-23)
Old 11-16-23, 01:56 PM
  #18  
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Hoping it's fixed for good!
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Cape600L (11-16-23)
Old 11-21-23, 02:31 AM
  #19  
Cape600L
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Just a quick note to close the circle on this for future reference. Have driven the car a couple hundred miles without a hiccup. Problem seems to have been solved. In 40 yrs of working on cars, have not run into this issue before. As in, with car idling, voltage at battery was all within specs. Battery light never came on in the instrument cluster. Probably should have monitored the actual voltage while graphing during a typical drive, but didn't. With Boykie help, decided to replace the alternator. Went to Rockauto, rebuilt Denso. Hoping it lasts. Onward and upward!
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Old 11-21-23, 04:33 AM
  #20  
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Originally Posted by Cape600L
FYI, the alternator on an AWD car only has 3 attachment bolts. There is a large crossmember under the alternator so all work has to be done from above as opposed to a non AWD version.
Awd models have 4 mounting bolts, if you only have 3 then your alt has been changed before and whoever did it was just to lazy to install the lower rear bolt. Probably the dealer.




Last edited by Gerf; 11-21-23 at 04:45 AM.
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