2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 114Get this manual
IGNITION IGNITION TEST EQUIPMENT
IGNITION TEST EQUIPMENT
IMPORTANT: The following equipment is available from various manufacturers to support ignition and electrical system troubleshooting
Ohmmeter
Used for various resistance measurementsMust be capable of reading low and high ranges Various models available: Merc-O- Tronic Number 700 VOA Stevens Number AT-1 01
Spark Testers
Stevens Number S48 or S48H Merc-O-Tronic Number 55-4S or 55-6S
IMPORTANT: Component temperature can affect resistance values at rate of 10 ohms per 1F (-17C)All resistance values listed in this manual are correct at 70F (21 C)