1988 Force 85HP again....

Sarentack

Seaman
Joined
Jun 29, 2012
Messages
60
Model 856X8A


As posted in previous threads: http://forums.iboats.com/force-chry...orce-problem-electrical-rectifier-601699.html

and one before that but it solved nothing.


Anyway, it refuses to get Spark on the #1 and #2. The #3 is fine.

I replaced Coil packs, CD packs, Trigger, and Rectifier.

I disconnected the Magneto, no avail.

I tried just about everything and have yet to get the #1 and #2 to spark.

Stator was also replaced by previous owner, not sure if that prevents spark to the 1 and 2 or not though.

Is there any suggestions?
 

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
18,087
Re: 1988 Force 85HP again....

Check the flywheel key? The magnet?
Magneto? Not on an 88
Just cause the stator is new doesn't mean it's good?
Replace all the wire connectors on ALL the parts.
They can look good but be broken under the shrink wrap.

Prestolite ADI Ignitions 1984-1992
General
1.Check for broken wires and terminals, especially inside the plastic plug-in connectors. We recommend that you remove the pins from the connectors and visually inspect them.
2.Check the flywheel for a broken or loose magnet.
3.Disconnect the kill wires from the CD and connect a DC voltmeter between the kill wires and engine ground, turn the ignition switch on and off several times. If, at any time, you see voltage appearing on the meter, there is a problem in the harness or ignition switch. At NO TIME SHOULD YOU SEE BATTERY VOLTAGE ON A KILL CIRCUIT.
4.Visually inspect stator for burned or discolored areas. If found, replace the stator. If the areas are on the battery charge windings, it indicated a possible problem with the rectifier.

IF NO FIRE ON ANY CYLINDER:
1.Disconnect kill wire AT THE PACK.
2.Check for broken or bare wires on the unit, stator and trigger.
3.Measure DVA voltage of the stator between the output wire sets. With everything connected, readings should be approximately 180 volts or more. Resistance readings between the stator wire sets range from 680 - 800 ohms.
4.Disconnect the rectifier. If the engine fires, replace the rectifier.

NO FIRE OR INTERMITTENT ON ONE CYLINDER:
1.Check stator and trigger resistance, trigger wire sets read approximately 50 ohms between the wire sets (DVA-5V or more), stator reads 680-800 ohms, DVA 180V or more from blue to yellow.
2.If readings are good, disconnect kill wire from one pack. If the dead cylinder starts firing, the problem is likely the blocking diode in the other pack.

NO FIRE ON TWO CYLINDERS:
•If two cylinders from the same CD unit will not fire, the problem is usually in the stator. Test per above.

ENGINE WILL NOT KILL:
•Check kill circuit in the pack by using a jumper wire connected to the kill wire coming out of the pack and shorting it to ground. If this kills the pack, the kill circuit in the harness or on the boat is bad, possibly the ignition switch.

COILS ONLY FIRE WITH THE SPARK PLUGS OUT:
•Check for dragging starter or low battery causing slow cranking speed. DVA test stator and trigger.

HIGH SPEED MISS:
1.DVA check stator voltage to each pack at high speed. If it exceeds 400 volts, replace the pack.
2.Disconnect the rectifier. If the engine fires smoothly, replace the rectifier.

Two Cylinder Engines with Combination CD Module with Built-in Ignition Coils
(1984-1988)


NO FIRE OR INTERMITTENT ON ONE CYLINDER:
1.Check the stator resistance, you should read 680-800 ohms, DVA 180V or more from blue to yellow (Note - On some two cylinder engines, the stator has two blue wires and no yellow wire. The stator will read from blue to blue). All stator wires should read open to engine ground.
2.Check the trigger resistance, trigger wire sets read approximately 50 ohms between the wire sets (DVA-5V or more), and open to engine ground.
3.If readings are good, disconnect kill wire from one pack. If the dead cylinder starts firing, the problem is likely the blocking diode in the other pack
 

Sarentack

Seaman
Joined
Jun 29, 2012
Messages
60
Re: 1988 Force 85HP again....

I dunno, I am just not finding anything, I do have a flat wire on the stator I am going to try and fix though, other than that, I cant find the problem. Most of these test were already done.
 

Sarentack

Seaman
Joined
Jun 29, 2012
Messages
60
Re: 1988 Force 85HP again....

Take that back.

Tried the kill wires (black/yellow) ones from CD packs, I was getting a good amount of voltage through them.

according to the above its wire harness or ignition switch.

What should I be looking for in both of them?
 
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