swathdiver
Full Access Member
Mods, Please feel free to move this to the appropriate forum.
Many GM cars and trucks frustrate their owners with flickering lights. You're driving along in your shiny new and expensive ride and your dash and headlights randomly dim making you feel like you're driving a clunker. GM sometimes has solutions for this but often says it is just normal.
To comply with CAFE standards, GM devised the Electrical Power Management system or EPM for short. I've seen no data saying how much fuel was saved and reckon it works best under controlled testing to warm the hearts of those bureaucrats in Washington at our expense.
It is my understanding that this was implemented beginning with the GMT900s or NNBS trucks and SUVs since 2007.
Coming off the negative battery cable and attached to the battery tray underneath and A/C pressure line is a 3-prong electrical connector. This is the Battery Current Sensor. Unplug this and the alternator will revert back to the normal way of charging and no more flickering lights. Unless of course, you have other problems! No CELs will result as a consequence of unplugging this sensor. It would be a good idea to tape off these open connections.
Many thanks to those who showed this to me and our fellow forum members earlier. I decided to repost as the original solution was buried in a "help me" thread if memory serves and we could not find it.
Many GM cars and trucks frustrate their owners with flickering lights. You're driving along in your shiny new and expensive ride and your dash and headlights randomly dim making you feel like you're driving a clunker. GM sometimes has solutions for this but often says it is just normal.
To comply with CAFE standards, GM devised the Electrical Power Management system or EPM for short. I've seen no data saying how much fuel was saved and reckon it works best under controlled testing to warm the hearts of those bureaucrats in Washington at our expense.
It is my understanding that this was implemented beginning with the GMT900s or NNBS trucks and SUVs since 2007.
Coming off the negative battery cable and attached to the battery tray underneath and A/C pressure line is a 3-prong electrical connector. This is the Battery Current Sensor. Unplug this and the alternator will revert back to the normal way of charging and no more flickering lights. Unless of course, you have other problems! No CELs will result as a consequence of unplugging this sensor. It would be a good idea to tape off these open connections.
Many thanks to those who showed this to me and our fellow forum members earlier. I decided to repost as the original solution was buried in a "help me" thread if memory serves and we could not find it.
