Forum -> outboard motors -> Mercury outboards

how do i test the coil packs and brain box on a 25 hp mercury outboard engine?
by: sam   on: Thursday, March 25 2010 at 14:09:10 EDT
 
Anybody could explain the procedure to me on how to test the coil packs and brain box on a 25 h..
by: sam   on: Thursday, March 25 2010 at 14:35:05 CDT
 
Anybody could explain the procedure to me on how to test the coil packs and brain box on a 25 hp mercury outboard engine?
Thanks!
by: vince   on: Thursday, March 25 2010 at 18:35:50 CDT
 
There are tests for the ignition charge coils (Stator Coils), the Trigger coils, and ignition coils..but there is no tests for the Control module..How this works is, test the components that you can, and if they test good, change the Control module..
If you have no spark at all, it is not the ignition coils - Odds of both coils going out at the time are "NOT"..
Give me your Model and Serial number of the engine and I will look the tests up for you..
by: sam   on: Thursday, March 25 2010 at 19:29:45 CDT
 
dont know the model but the only serial # i can find is 0b224421.
by: vince   on: Thursday, March 25 2010 at 20:29:02 CDT
 
The serial Number came up as a Belgium Engine (Weird, Unless Your In Belgium !!!)
The Model # is 1025227 - Ser# OB224421 - 25 HP Twin Cylinder Mercury / Mariner..
The parts below are -
All Tests are using a DVA (Direct Voltage Adapter) Type Meter With Sparkplugs Removed and Coils Attached to a Spark Board (Use The Sparkplugs Grounded to Block)
Stator/Charge Coil - #2 - 20V+ High Speed Coil / 180V+ Low Speed Coil
Sensor Coil - #7 - Same Test as Above - 5v Pulsing
Ignition Coils # 11 - 180V+ Pulsing From Control Module
Power Pack / Ignition Control Module - # 20 = PN#339-7452A3 No Longer Available From Mercury but is Available From CDI Electronics PN# 114-7452A 3 For = $158.00

by: sam   on: Friday, March 26 2010 at 10:29:19 CDT
 
is there an ohm reading i can do on it and if so which wires read what.
by: vince   on: Friday, March 26 2010 at 13:30:35 CDT
 
Ohm reading on the Ignition Computer??? No..
Ohm readings on Coils is a haphazard way of testing, if it test bad it may not be, This is because the resistance will vary with temperature and age.
I could not find the values for the coils, and I would not recommend this method of testing.
We do see these resistance measurement for other models, but once again we don't recommend this type of testing.
Either it will produce the required voltage or it won't, much better.
The DVA volt meter is available from SIERRA Marine Supply and Cost about $65.00, less than a hour labor at the shop.

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