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Message: <blockquote data-quote="__roger__" data-source="post: 28503" data-attributes="member: 13338">Thanks everyone. You have been a lot of help! I took a picture of my RPO codes and fed them to chatgpt:Based on your RPO list, the key code here is:<ul> <li data-xf-list-type="ul">KW1 – High-capacity generator (alternator)</li> </ul>For a 2006 Suburban 1500 with the L59 5.3L, KW1 typically corresponds to: 145-amp alternator (standard "high output" unit for SUVs with rear A/C, Bose, etc.)I just confirmed my Rockauto order, and see that I actually orderd the 105 Amp belt. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused    :confused:" loading="lazy" data-shortname=":confused:" />At least I won't every forget what size alternator and belt I have.</blockquote>