SteveVT
Petty Officer 2nd Class
- Joined
- Jul 31, 2017
- Messages
- 163
(My motor serial # 0C154840)
I have an '89 Mariner 25 hp EL with CDI ignition, and it takes the standard two 7370A13, 832757A4 type coils. One of originals on the motor is bad.
So I sent for a replacement, and what arrived was a CDI Electronics part #184001.
I put the new coil in the engine, and it didn't work -- weak spark, cylinder would only kick once in awhile.
To check it, I swapped it over with the good coil in my engine, and then found that the non-firing cylinder started firing, and the good cylinder stopped firing. The only difference was swapping of the coils.
To check the coil itself, I took it off of the engine and did a resistance test. The (secondary) resistance between the plug hole and the negative terminal was 1400+ ohms.
Looking in the OEM Mariner manual, the acceptable range was quoted as 850-1200 ohms. So, clearly out of spec.
Here's where it gets confusing. Looking at CDI Electronics installation sheet that came with the coil, it says secondary coil resistance should fall between 1.28k and 1.48k. Which would disagree with the Mariner/Merc OEM spec.
So I'm left wondering if this is either just a lemon, or actually the wrong coil for this ignition?
Anybody else using these?
What resistance do the Sierra equivalents show? Are they in the 850-1200 ohm range?
I have an '89 Mariner 25 hp EL with CDI ignition, and it takes the standard two 7370A13, 832757A4 type coils. One of originals on the motor is bad.
So I sent for a replacement, and what arrived was a CDI Electronics part #184001.
I put the new coil in the engine, and it didn't work -- weak spark, cylinder would only kick once in awhile.
To check it, I swapped it over with the good coil in my engine, and then found that the non-firing cylinder started firing, and the good cylinder stopped firing. The only difference was swapping of the coils.
To check the coil itself, I took it off of the engine and did a resistance test. The (secondary) resistance between the plug hole and the negative terminal was 1400+ ohms.
Looking in the OEM Mariner manual, the acceptable range was quoted as 850-1200 ohms. So, clearly out of spec.
Here's where it gets confusing. Looking at CDI Electronics installation sheet that came with the coil, it says secondary coil resistance should fall between 1.28k and 1.48k. Which would disagree with the Mariner/Merc OEM spec.
So I'm left wondering if this is either just a lemon, or actually the wrong coil for this ignition?
Anybody else using these?
What resistance do the Sierra equivalents show? Are they in the 850-1200 ohm range?
