Abstract: The purpose of this study to determine the effectiveness of mock up trainer model in order to improve student’s performance in test and repair wiring/lighting system, car alarm system and servicing central locking system. This study adopted one group before and after experimental research design in conducting and gathering information. The training and instruments were administered to 40 third year students in Bukidnon State University, Malaybalay City, Bukidnon. Furthermore, this study used descriptive statistics such as frequency, mean, percentages and standard deviation to describe the respondents. The study utilized the F-test and t-test to establish the difference and regression analysis to measure the extent of effect of input and process variables to output variable. The study found out that the instructional trainer has yielded is positive significance in the program status and highly significant in pre-test result. These are in terms of its effects in output variable and written post-test evaluation. The effect is negative and significant in parent’s monthly income, significant in pre-test practical and input process variable’s effect in post-test practical evaluation. The following conclusions and implications were drawn. The mock up trainer has been instrumental in improving student’s score in test and repair wiring/lighting system, servicing car alarm system and a servicing central locking system. This is because the trainer serves as the medium of instruction to help develop the learning of the students for the automotive electrical system, car alarm with central locking system and other automotive vehicle accessories such as ignition system. Understanding such basic principles will enable the students to be self-reliant, more confident of themselves and they will be able to perform auto electrical and car alarm with central locking system installation and trouble-shooting circuits.