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pulsing lights & runs rough on idle only
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Question
01burban
2007 Suburban LTZ 115k
So recently I have been noticing my dash lights, dome lights and exterior lighting (not head lights... explain that later) pulsating on idle. Whether the Voltage Gauge shows shows 14v or a reserved high 12v, on idle it pulses. Now Ironically I have also noticed my engine running rough on idle also almost around the same time the pulsing lights appeared. I installed a new battery about 6 month ago simply cause it was cold out the the old one died.
Now for the part that you may not want to hear but should know, I did install an HID headlight setup which also has some fancy LEDs in it but all was good until maybe a month after that when the pulsing appeared. Now the headlights are not even on when this happens so there is no odd draw or issues with the ballasts because there is simply no power being sent to them. When they do go on, it makes no difference to the pulsing lights throughout the truck during idle. Headlights stay perfectly solid and have no effect.
I have read many posts about pulsing lights coupled with rough idle. Many of these people have solved there issues with a new alternator. I would normally go ahead and replace it anyways being on 115k but I am on a tight budget and don't want to start repairing things just cause it worked for others. A reputable tech that backs up the Alt. suggestion would definitely put me at ease for that repair. Any other test or thoughts would be greatly appreciated.
regards,
Ron
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