DGP301 Glow Plug Tester 12V Diesel DGP301 Glow Plug Tester provides fault detection thru LED's for a quick analysis of short circuit over current normal operation and open circuit/under current. It allows for testing without removing glow plug from engine and powers the glow plug to test the plug in its operating state. Much more accurate test than a cold resistance tester which can miss short circuits



Designed To Work On 12V ONLY !


Ø  Disconnect the busbar or leads from the glow plugs to be tested;

Ø  Connect the RED battery clamp to the positive terminal of the battery, and the BLACK battery clamp to the negative terminal of the battery;

Ø  Push the contact plate in the end of the test probe onto the glow plug;

Ø  Terminate until the glow plug has warmed up. This might take between 3 and 20 seconds (Check manufacturers specs for exact warm-up time)

Ø  Check which LED is illuminated on the control panel; 

Short Circuit---Defective glow plug

>16A---Defective glow plug (more than 3 seconds)

<7A---Defective glow plug (high resistance )

Open Circuit---Defective glow plug

Low Battery---Check source battery volts


NOTE:  Even all 4 glow plugs are open circuit, DO NOT assume this tool is faulty. The vehicle might be still started up with all 4 glow plugs being defective.