2004 Chevrolet Avalanche Owner's Manual - Page 351
2004 Chevrolet Avalanche Manual
Page 351 highlights
Auxiliary Battery The auxiliary battery provision, if equipped, can be used to supply electrical power to additional equipment that you may choose to add. If your vehicle has this provision, this relay will be located on the passenger's side of the vehicle, next to the auxiliary battery. When using this provision, connection should only be made to the upper stud (A) of the relay. do not make connections to the lower stud (B) of the relay. The auxiliary battery circuit is protected by a megafuse located behind the auxiliary battery. Be sure to follow the proper installation instructions that are included with any electrical equipment that you install. Notice: Leaving electrical equipment on for extended periods will drain the battery. Always turn off electrical equipment when not in use and do not use equipment that exceeds the maximum amperage rating for the auxiliary battery provision. 4-79
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