Ignition help.

1

10Rams

Cadet
Joined
Jun 30, 2014
Messages
26
Hello, I have a 1986 mercury 75 4 cylinder. It has been sitting awhile but I replaced the trigger with a CDI trigger one wire was missing insulation. And I replaced the stator with a sierra as it had missing insulation on both yellow wires. Everything was fine as I had check to make sure the timing was correct on the muffs. Upon taking it out for the first time I had very little power. Checked plugs and the top 2 cylinders are not firing. Trigger resistance checks out fine. I swapped trigger wires and the problem stayed the same. I swapped stator wires and the problem stayed. What are my chances the switch box died out randomly?
 
Last edited:
1

10Rams

Cadet
Joined
Jun 30, 2014
Messages
26
I think I have narrowed down my problem to the switch box. Mainly posting these specs for others to see and help solve a problem. Will report back when the new switch box arrives.
 
1

10Rams

Cadet
Joined
Jun 30, 2014
Messages
26
Stator resistance

—————————

Resistance blue to blue white - 5950

Red to red white -141

Stator DVA test
————————
Blue - blue white connected - 2v 95% of the time then jumps to volts 240 ish

Disconnected - constant 320v

Red - red white connected - 2v 95% of the time then jumps to 50 volt connected

Disconnected - constant 50v

————————————

Trigger resistance Disconnected

Purple to white - 887

Brown to wht/blk - 905

Purple to grnd - 0L

Brown to grnd - 0L

White to grnd - 0L

Wht/blk to grnd - 0L

———————————-

Trigger DVA volts connected

Purple to white - 5.75

Brown to blk/wht - 4.7

Purple to gnd - 4

Brown to gnd - 3.5

White to gnd - 3.8

Wht/blk to gnd - 2.3
 
1

10Rams

Cadet
Joined
Jun 30, 2014
Messages
26
Replaced switch box and I now have spark on all 4. Just need a water test now!
 
R

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
38,411
If you just bought this motor , then a new water pump impeller is a good idea.
 
1

10Rams

Cadet
Joined
Jun 30, 2014
Messages
26
racerone said:
If you just bought this motor , then a new water pump impeller is a good idea.
Click to expand...
Agreed. The stream is weak. I wanted to make sure it would run before throwing more parts. Impeller is next on the list!
 
A

AnnaLewis

Recruit
Joined
Nov 19, 2024
Messages
2
10Rams said:
Stator resistance

—————————

Resistance blue to blue white - 5950

Red to red white -141

Stator DVA test
————————
Blue - blue white connected - 2v 95% of the time then jumps to volts 240 ish

Disconnected - constant 320v

Red - red white connected - 2v 95% of the time then jumps to 50 volt connected

Disconnected - constant 50v

————————————

Trigger resistance Disconnected

Purple to white - 887

Brown to wht/blk - 905

Purple to grnd - 0L

Brown to grnd - 0L

White to grnd - 0L

Wht/blk to grnd - 0L

———————————-

Trigger DVA volts connected

Purple to white - 5.75

Brown to blk/wht - 4.7

Purple to gnd - 4

Brown to gnd - 3.5

White to gnd - 3.8

Wht/blk to gnd - 2.3


It’s possible that the switch box could have failed, especially if it's old or has been exposed to moisture or heat. Since the trigger and stator have been replaced, testing the switch box with a multimeter for proper resistance can help diagnose the issue. If faulty, replacing it might fix the problem. Applying to college can be stressful, especially when writing a compelling admission essay. I used https://academized.com/write-my-admission-essay 'write my admission essay' service, and I’m so glad I did! The writer crafted a personalized, impactful essay that reflected my strengths and achievements. It captured my voice perfectly while highlighting what made me a strong candidate. The entire process was seamless, and the essay exceeded my expectations. I’m incredibly thankful for their help!
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Any new updates after this?
 
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