Reyhan Blog: Bosch Coil Test

Bosch Coil Test

Disconnect the distributor wire. Test the secondary circuit of the ignition coil.

Accuspark Wiring Diagrams

It will be marked with a sign or it might only be indicated by a number.

Bosch coil test. Performing an ignition coil spark test 1 turn the vehicle off and open the hood. According to the smart folks at the shop talk forums only one coil is worth purchasing the bosch made in brazil. It comes with 3 way male terminals on both posts.

Connect your multimeter to the positive terminal or pin of your coil and to the high output terminal that goes to the spark plug. The reading should be 10 to 60 ohms no more. Momentarily ground the other terminal repeatedly.

It has a part number stamped into the bottom. Move the black lead to the coil negative terminal and watch the display. Better is to test the coil under actual load.

Move the black lead to the coil tower and probe the contact inside the tower. The reading should be less than 1 ohm. The 12 volt pole is the spot where the power comes into your coil.

It can be identified by 4 tests. As with most types of vehicular maintenance youll want to begin the test with the vehicle in park and with the engine off. Turn the key on or connect 12v to the terminal.

To test the coils secondary winding attach the test probes to the outer 12 volt pole on the coil and the center pole where the main wire goes to the distributor. In this video i show you exactly how you can quickly determine whether you have a bad ignition coil pack or not and what is the correct testing procedure to make sure it is indeed the coil and not.

Testing Ignition Coils

Replacement Cdi Coil