by peobryant » Mon May 11, 2009 9:11 pm
Turning the A/C on does put a bigger load on the engine, so it could cause the RPM to drop.
Are talking about the voltage gauge fluctuating?
Parker
1991 Dodge Ram D350, Cummins Turbo Diesel, A518
1972 Mercedes-Benz 220D, OM615 Diesel, 4 Speed Manual