no spark...72 johnson/pulsepack and yes i've done all the tests!!

Orkazim

Cadet
Joined
Apr 20, 2003
Messages
12
Ok, I'm new to the list and semi-new to boating. Now I have a 72 Johnson 85 hp. This motor according to my research never came with solid state ignition, only points. Well my motor has a pulse box thats says Wabash on it and no signs of any points. Now I am assuming that this is an aftermarket deal or maybe someone pulled this setup off of another motor that uses the pulse pack and swapped. I understand that OMC had Wabash build their boxes for them but not sure if they all had Wabash on the sticker or not. The wiringon my motor is now exactly the same as it would be(according to clymer) on a 69-72 100,115,125. everything is clean and appears to be in good shape. <br /><br />Now here is my story...Bought the motor, heard it run before hand,roughly, got to the shop put the motor on the boat and got it running nice with good gas and a little playing. Now I head to the river and put in and now got no spark. 3 days prior at my shop I had it running fine. <br /><br />Ok now I have done all the logical things associated with getting this dude to fire and also all the tests laid out by clymer. Main question, on the pulse pack side, if I ohm out the kill wire(black with green) should that wire be grounded? It has continuity between it and the block, and when I turn the ignition on I get a voltage reading. This is with the plug disconnected and the box isolated from the anti-reverse spring and sensor. Should this side of the wire be grounded and also have voltage when I turn the key to on? Could this be my problem? I am getting 12 volts to the box and about 10 under cranking. I've attatched my digital voltmeter to the output of the pulse pack and get no reading. I will try the lightbulb test tomorrow to see if I get anything. <br /><br />My ohms reading on everything work out to specs as described by clymer. Would the stator have anything to do with firing? If I check voltages under cranking what should i get? I have 9.3 VAC RMS between the two leads not hooked up and 8 VAC RMS with the leads hooked up. Now this is not using a peak volt meter, but if I understand correctly I can multiply these numbers by 1.141 (see i do remember something from those college classes) and get Peak? Or does this not always work under this situation. <br />Can I check the sensor in the same way? Between the two leads or between them seperately and ground? As I stated before they ohm out correctly but can I crank the motor and get a voltage from them and is it AC or DC. <br /><br />Ok last thing is if it is the pulse pack being bad, can I fix it as I've seen some people talk about if you can remove all the lovely goo on the board. I have large experience with circuit boards and their designs and am able to read schematics and all that wonderful stuff. Or I've also heard of some people using a GM something and coil...as we all know these pulse packs are a pocket buster. <br />Well thanks for all the help in advance and i know thats a lot to read but as a troubleshooter myself I know what people want to see!! <br />Anything you can send me or ideas to check this or that please let me know!<br /><br />No-T<br /> cjs@ezworks.net
 

Franki

Lieutenant Junior Grade
Joined
Feb 16, 2002
Messages
1,059
Re: no spark...72 johnson/pulsepack and yes i've done all the tests!!

I have the 100ESL72 100HP 72 Johnson, and they don't have points..<br /><br />As I understand it, the 100 and the 85 are nearly identical. and according to the specs i have here (from Alcan on this forum) they both don't have points from the factory.. so your setup is unlikely to be after market.<br /><br />I tried to fix my fried powerpack as well, but I did more damage getting the resin off then I could easily fix.. so in the end I bought another one.<br /><br />IF all else fails, apparently you can get the earlier points setup from johnson/evin and fit it to the 72 model.. I bought a 68 rude for just that purpose.. so if I need to, I can swap it over..<br /><br />Wish I could help you with the wiring, but it was ages ago, and I have forgotten it all.. I do know that the enemy of these packs is bad earths.. I made a point of doubling up on my earth wiring, so as to make sure I don't blow it up again.<br /><br />hopefully Schematic will see this and give you some specific info on trouble shooting it.<br /><br />good luck.<br /><br />regards<br /><br />Franki
 

ledgefinder

Ensign
Joined
May 2, 2002
Messages
916
Re: no spark...72 johnson/pulsepack and yes i've done all the tests!!

The 1972 85hp does (from the factory) have points and a CD box. The points, two pairs of them, are under the flywheel, as is your distributor. The points act as a trigger for the CD box, rather than directly providing current to the coil. The higher-hp motors 1969-72 had sensor coils taking the place of the points, and a different CD box.
 

bowhuntrrl

Petty Officer 1st Class
Joined
Mar 26, 2003
Messages
320
Re: no spark...72 johnson/pulsepack and yes i've done all the tests!!

I'm pretty sure Sierra sells a replacement box for about $240.<br /><br />rich
 
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