ABYC Diesel Practice Exam

What should be checked first if an engine is not starting after recent electrical work?

1. Fuel pressure

2. Fuse integrity

3. Connection point for GPS power

4. Engine oil level

The correct answer is: Connection point for GPS power

When diagnosing an engine that is not starting after recent electrical work, the first priority should be to verify the integrity of the electrical connections and components that were worked on. This includes checking the connection point for GPS power. If there was any interference or alteration to the electrical system during the installation or servicing of electrical devices, it could potentially impact the engine's ability to start. Ensuring that the power supply and connections are secure and correctly configured is crucial, as any electrical issue can prevent the engine from receiving the necessary power to operate. Other potential areas related to the engine's functionality, such as fuel pressure and fuse integrity, are also important, but they should be considered after confirming that all electrical connections, including those connected to the GPS or other recent installations, are intact and functioning properly. Checking the engine oil level is important for overall engine health, but it isn't a primary concern in this specific scenario of an engine failure due to recent electrical modifications. Thus, starting with the connection point for GPS power makes sense as a logical first step in troubleshooting the problem.