How can you check the starter-motor`s external wiring circuit for voltage drop.?
Hi As previously stated, you can measure the voltage across the motor under load with a multimeter. However, you need to be very careful around engines that are running, or turning on the starter, not to mention accessibility problems. Assuming you have an issue with poor starter performance, you can use your headlights as a guide. Starting with a known good battery – and the headlights on – crank (start) the engine. The headlights should dim as the starter draws a very large current, if they do not it is a sign that there is an electrical fault in the starter circuit. Assuming the motor is not faulty – check the heavy cables, especially the terminations at the battery / starter are clean and secure. One area often overlooked is the engine earth strap – just like the big earth lead on the battery – usually bolted on the engine (or gearbox) and then to the body nearby. These provide a good return path for the starter and are prone to corrosion and damage, any faults of this nature are u
