Indian Journal of Information Sciences and Computer Application. Volume 1, Number 1 (2013), pp. 19-30 © GBS Publishers & Distributors (I) http://www.gbspublisher.com Improving Fault Tolerance and Quality of Service in Wireless Networks using Weighted Clustering Algorithm S.K.B. Rathika 1 and S.K.B. Sangeetha 2 1 Assistant Professor, Department Of Computer Science and Engineering, SNS College of Engineering. 2 Assistant Professor, Department Of Computer Science and Engineering, Vellammal Engineering College. E-mail: rathika.skb@gmail.com, rathika.skb@gmail.com Abstract A Mobile Ad Hoc Networks (MANET) is a collection of two or more mobile devices (e.g. PDAs, laptop, cell phones, etc.), with multi-hop wireless communication. This paper introduces a new type of algorithm called Enhancement on Weighted Clustering Algorithm [EWCA] to improve the load balancing and the stability in the MANET. And then it reduces the cluster over head. The cluster head that is selected efficiently based on these factors like, high transmission power, transmission range, distance mobility, battery power and energy. Since the cluster head will not be changed dynamically it takes more times to change the cluster head, average number of cluster formation will be reduced. By applying the load balancing factor, the over head in the cluster is reduced. In this simulation study, a comparison was conducted to measure the performance of our algorithm with original weighted clustering algorithm [WCA] in terms of numbers of clusters formed with satisfying load balancing, topology stability, and number of cluster head change is reduced. Index Terms: Mobile ad-hoc networks, weighted clustering algorithm, load balancing.