Inductive Timing Light (DIS) #3551a

This best seller is a must have for every tune-up kit. The Innova 3551 works with most ignition systems: DIS, conventional, electronic and computer-controlled systems - domestic and imports.

Free shipping | 1-Year Warranty


This product can expose you to chemicals including DiNP, which is known to the State of California to cause cancer.
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Powerful Capabilities:

Check timing, diagnose a no-spark condition, check for electronic advance/retard and more.

Slim, Rotating Barrel:

Allows for easier and better aiming at the timing mark.

Detachable Leads:

Make replacements and storage easy.

Patented Skip Circuitry Test:

Tests up to 9,990 RPM.

Built-in Hand Guard:

Protection from moving parts in the engine bay.

Need more help?
Inductive Pickup



Where do I connect the red and black clamps on my vehicle?
Place the RED lead onto the positive (+) side of the battery. Place the BLACK lead onto the negative (-) side of the battery, or the chassis of the vehicle.

Diesel vehicles do not have spark plugs or distributor. Therefore, our timing lights will not work on diesel engines.

No. Our timing light will only work on 12V negative ground system. Some pre-1960’s vehicles used positive ground systems. Check service manuals for the correct ground systems.

You can download a copy of the Product User Manual from our website: 

Your timing light may be used on vehicles with 6-volt electrical systems by using the following connection procedure: 12-volt automotive battery required.
1. Connect the RED battery clip to the positive (+) terminal of a 12-volt battery.
2. Connect the BLACK battery clip to the negative (-) terminal of a 12-volt battery.
3. Using a length of 18AWG jumper wire, ground the negative (-) terminal of the 12-volt battery to a known-good ground on the vehicle under test.
No. The 3551 Timing light does not support 2 cycle/stroke engines. Our 5568 timing light will work on 2 cycle/stroke engines.

No, unfortunately not. Our timing lights will only work on conventional breaker point, electronic ignition systems, or with DIS (distributorless ignition systems). 

Consult the vehicle's service manual for procedures and specifications.
Make sure the upper and lower ferrite cores of the inductive pickup clip are clean. Also, make sure the inductive pickup clamp is properly connected to the No. 1 spark plug cable.
Make sure the battery clips are firmly connected to the battery terminals. Make sure the battery clip polarity is correct (red battery clip is connected to the positive (+) battery terminal, black battery clip is connected to the negative (–) battery terminal).