Address autoconfiguration of resource constrained MANETs is a challenging issue for decades. The heterogeneity, multi-interfaces, extreme resource constrains and miniaturization of the nodes participating in multiple networks affects the autoconfiguration schemes. The significant roles of resource utilization caused by multiple communications and its challenges to autoconfiguration have not drawn attention. A cross layer approach called Selective address allocator configuration protocol (SAACP) has been proposed to enhance the service responsiveness and continuity of the autoconfiguration scheme used for resource constrained nodes. The SAACP protocol is a stateful autoconfiguration protocol which selects the address allocator using a weighing algorithm .The algorithm derives weightage for the nodes based on the node’s resource utilization information collected from different layers of network stack. The cost and performance of the proposed scheme has been analyzed using mathematical formulations and simulations respectively. The simulation results show that the proposed scheme reduces address allocation latency, packet losses and protocol overhead and correspondingly increases successful allocation ratio. The scheme proves to perform well even in high resource constraints, node mobility, network merging and partitioning.