Using this to test the coil on my vehicle. I get intermittent small reddish flash. Not sure how to interpret this? Is any light a positive sign?

Use the tester in a dim lighting area and when you see the reddish-orange flash, that shows a bad spark. A healthy spark will be more intense with a blueish-white spark. I used this tester on my riding mower on June 1, 2015 and replaced the ignition module (same as a vehicle coil). The tester showed the difference before and after!

Can this be used for my 115 outboard motor?

Yes Ihave used it Mine and Ihave Used it on Lawnmovers

How do you use this with a lawnmower that doesn't start? Hooking it up is simple, but then what? Pull the recoil starter rope & look at the light?

Yes, if it starts the light will flash everytime the sparkplug sparks. If it does not start the light will flash everytime the sparkplug gets power and then you know it is not an electrical problem. It can then be either a bad sparkplug or a fuel problem. If it does not flash when you pull the rope then it is an electrical malfunction (ie. magneto, points, or electronic ignition problem). Always test your light to make sure it works on something else that runs.

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⚡ Spark your engine diagnostics into the fast lane!

COMPACT LIGHTWEIGHT - At just 141g and 10.5 inches, it’s the perfect tool for on-the-go pros.
PRECISION METAL BUILD - Durable metal construction ensures reliable performance and longevity.
DUAL ENDED VERSATILITY - Straight and 90° boots on one tool for seamless access in tight engine spaces.
RAPID IGNITION INSIGHT - Diagnose spark plug issues in seconds to keep your engine running flawlessly.
UNIVERSAL COMPATIBILITY - Works effortlessly with all ignition systems and air cleaner setups.

The Lisle 20610 Inline Spark Tester is a compact, dual-ended metal tool designed for quick and accurate ignition system diagnostics. Compatible with all spark plug wires, it features both straight and 90-degree boots for versatile use, making it an essential, durable tool for professional mechanics and DIY enthusiasts alike.

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Color	Red
Size	1 Pack
Style	Tool
Compatible with	Air Cleaner
Height	1.4 inches
Item display length	10.5 inches
Weight	141 g
Item display width	5.7 inches
Material type	Metal
Number of items	2
Power source	Corded Electric
Usage	personal
Included components	Spark Tester
Batteries included?	No
Brand	Lisle
Department	unisex-adult
Manufacturer	Lisle
Item model number	20610
Product Dimensions	26.67 x 14.61 x 2.54 cm; 113.4 g
ASIN	B0002STSC6

Lisle 20610 Inline Spark Tester

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