Search found 11 matches

by Polarue
Sat Sep 08, 2018 11:22 am
Forum: SMALL BOAT ELECTRICAL
Topic: Mercury 40-Ampere Stator and Capacitor Discharge Ignition
Replies: 10
Views: 12421

Re: Stator Construction

Stator Construction More on the stator and its construction. The 40-Ampere stator uses ten coils of 14-AWG magnet wire for the 14-Volt alternating current energy generated. The smaller four ignition coils use 35-AWG wire for the high-speed coils and 41-AWG for low-speed coils. The blue wire (low-sp...
by Polarue
Tue Sep 04, 2018 12:59 pm
Forum: SMALL BOAT ELECTRICAL
Topic: DC Power Distribution Updating
Replies: 2
Views: 8264

Re: DC Power Distribution Updating

Nice job there on your boat. The only thing I would add is that if dielectric grease is added as a protective coating against further oxidation, the connection reliability and performance is maintained and extended considerably. In my mind, any electrical connection in a marine environment should ha...
by Polarue
Tue Sep 04, 2018 12:29 pm
Forum: SMALL BOAT ELECTRICAL
Topic: Mercury 40-Ampere Stator and Capacitor Discharge Ignition
Replies: 10
Views: 12421

Re: The Bias Circuit in Switchbox

The Bias Circuit in Switchbox Another aspect of the switchbox function is the BIAS circuit. The BIAS circuit is provided on a wire with white insulation with a black stripe that connects the two boxes. This circuit has a negative voltage when read with a voltmeter. The manual states -1 to -6 Volts ...
by Polarue
Mon Sep 03, 2018 4:06 am
Forum: SMALL BOAT ELECTRICAL
Topic: Navigation lights take 5-10 minutes to turn on
Replies: 10
Views: 12012

Re: Navigation lights take 5-10 minutes to turn on

For all bulb connections and the tabs on the rear of the carling type 20amp switches, I would recommend a dielectric grease which is usually silicone based. Cover the contact surfaces completely and attach. Any auto supply store will have tubes for about 5 bucks which will last you a very long time....
by Polarue
Fri Aug 31, 2018 5:59 pm
Forum: SMALL BOAT ELECTRICAL
Topic: Mercury 40-Ampere Stator and Capacitor Discharge Ignition
Replies: 10
Views: 12421

Re: Cost to Rebuild Switchboxes

Cost to Rebuild Switchboxes On another side note, It cost me $20 to rebuild and upgrade my four switchboxes to bulletproof, but the stator is another project. Main differences in the quality of the OEM compared to the aftermarket switchbox that I own are: ⋅ Higher quality board, posts, nu...
by Polarue
Fri Aug 31, 2018 5:56 pm
Forum: SMALL BOAT ELECTRICAL
Topic: Mercury 40-Ampere Stator and Capacitor Discharge Ignition
Replies: 10
Views: 12421

Re: Mercury 40amp stator design plus ignition

Side note on CDI efficiency. Due to the use of capacitors, the energy loss is 50-percent in the ignition circuit just from the capacitor alone. A much more efficient ignition would be to have the main 12-Volt battery drive the ignition coils and use the SCR switching to turn them off and on. These 1...
by Polarue
Fri Aug 31, 2018 5:44 pm
Forum: SMALL BOAT ELECTRICAL
Topic: Mercury 40-Ampere Stator and Capacitor Discharge Ignition
Replies: 10
Views: 12421

Re: SCR circuit

The SCR Circuit Each trigger wire actually produces two pulses per revolution of the flywheel which are rectified by the switchbox. Only the positive pulse is used to trigger a SCR which in turn triggers a second larger SCR that releases the capacitor energy to the ignition coil. The SCR only needs...
by Polarue
Fri Aug 31, 2018 5:30 pm
Forum: SMALL BOAT ELECTRICAL
Topic: Mercury 40-Ampere Stator and Capacitor Discharge Ignition
Replies: 10
Views: 12421

Re: How the Trigger Circuit Works

How the Trigger Circuit Works The trigger assembly consist of three coils spaced 120-degrees apart around the hub magnet in the flywheel. The flywheel hub magnet is two poles, one North and one South. As a South pole passes a coil, a positive pulse is in one wire from the coil. The other wire is po...
by Polarue
Fri Aug 31, 2018 5:11 pm
Forum: SMALL BOAT ELECTRICAL
Topic: Mercury 40-Ampere Stator and Capacitor Discharge Ignition
Replies: 10
Views: 12421

Re: Basics of the Mercury Switchbox Circuit

Basics of the Mercury Switchbox Circuit The power enters the switchbox via the blue and red wires [from the associated coils]. This alternating-current power is then rectified on the positive half-wave only; the negative charge pulses are not used. This rectified half-wave of positive voltage is se...
by Polarue
Fri Aug 31, 2018 4:49 pm
Forum: SMALL BOAT ELECTRICAL
Topic: Mercury 40-Ampere Stator and Capacitor Discharge Ignition
Replies: 10
Views: 12421

Re: Basics of the Mercury 40-Ampere Stator

Basics of the Mercury 40-Ampere Stator There are two main coil groups. First, the large coils that are connected to two pairs of yellow wires provide for a total of close to 40-Amperes output at high engine RPM. The 20-Amperes plus 20-Amperes coil pairs are rectified from alternating current (AC) t...
by Polarue
Fri Aug 31, 2018 3:46 pm
Forum: SMALL BOAT ELECTRICAL
Topic: Mercury 40-Ampere Stator and Capacitor Discharge Ignition
Replies: 10
Views: 12421

Mercury 40-Ampere Stator and Capacitor Discharge Ignition

Hello everyone, I have been researching information on the 40-Ampere stator charging system that is on my 1998 Mercury 175-HP 2.5-liter v6 EFI two-stroke outboard that I recently purchased. I have spent much time on this engine, and I want to share some additional information regarding this engine a...