Optimax coils

strum

Cadet
Joined
Jun 2, 2022
Messages
8
Anyone know how to properly test 2004 150 hp optimax coils? ser no ot862351
I want to bench test them best I can before install. thanks guys
 

Makomadness

Cadet
Joined
Jun 5, 2022
Messages
10
Anyone know how to properly test 2004 150 hp optimax coils? ser no ot862351
I want to bench test them best I can before install. thanks guys
You can measure the resistance of the coil and compare each to the others. It is easier to use a spark tester with the coils installed and the motor cranked over (or run). No spark or weak spark should be obvious.
If you have suspected coil issues, it may help to take a look at the coils and wires in the dark to see if there is stray discharges or arcing.
 

strum

Cadet
Joined
Jun 2, 2022
Messages
8
Thanks man. I had a duel coil driver for #4 and #1 go bad .. so after swapping drivers around to diagnose I bought a new one .. all was good for a few trips then it started cutting out randomly and then the coil driver for #4 and #1 went out again. because of swapping out the new one was on a different set of coils. So I purchased a used complete assembly. Bench testing all 12 coils I have I couldn't find any big differences in reading But i knew # 4 or #1 must have been shorting out causing the driver to go bad. Any way I ended up replacing those 2 coils and driver from the assembly I bought. I even went through all the plug wires using the 6 with the least resistance. and although my plugs are new I pulled them and made certain all the gaps are the same. Engine is running great now .. no cutting out and stronger than ever. I never found what the value ranges are suppose to be on those coils .
 
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