Mechman 400 Amp High Output Alternator For 05-13 GM Truck 4.3L - 6.0L

This unit comes equipped with a smaller 1.75 inch diameter alternator pulley, and will require a slightly shorter drive belt for proper belt tension. Not recommended for sustained use above 5,000 RPM engine speed. If you DO NOT use the correct shorter belt, this will result in very low to no output and create extra work load for the alternator. There is no extreme voltage fluctuation as this will bypass the RVC charging system on all 2005> GM truck applications. Product Dimensions: 5.79" (depth) x 5.69" (width) Mechman 400 Amp High Output Alternator For 05-13 GM Truck 4.3L - 6.0L This Listing Includes: (1) 400 Amp High Output Alternator MM-8302400 (1) P101 Harness (1) P103 Module This unit comes equipped with a smaller 1.75-inch diameter alternator pulley and will require a slightly shorter drive belt for proper belt tension.  Not recommended for sustained use above 5,000 RPM engine speed. ((Check instructions section for finding belt sizes and wiring)). If you DO NOT u