1969 evinrude 115 hp pulse pack trouble

[dcbisbee]

I have a 115hp 1969 evinrude outboard that has just lost A new pulse pack.
It had app. 8-10 runs on it. I have purchased a new one, but want to know what else could be wrong, as I dont want to burn up the new one. Is this engine supposed to charge my battery, and could this be why my tach doesnt work and could this be why I have lost my pulse pack. any info on this ignition system would be of great help.

 

[F_R]

Re: 1969 evinrude 115 hp pulse pack trouble

The pulse pack system was very sensitive to stray voltages and spikes. Your motor has an ignition safety circuit that is supposed to protect it from such things. I have heard that the safety circuit is no longer needed on new packs nowadays....I am ignorant concering that question. Yes, your motor is supposed to charge the battery. Your problems may very well be related. You must check EVERYTHING before putting in a new pack. Loose, dirty, corroded connections are the chief culprits, both for knocking out the alternator and the pack.

 

[rockyrude]

Re: 1969 evinrude 115 hp pulse pack trouble

I've got a '69 115 hp and found the two wires that go from the pulse pack up to the sensor under the flywheel had their insulation rubbed through from the advance moving the wires against the block. It's a bit of a pain but is a repairable set of wires.

 

[dcbisbee]

Re: 1969 evinrude 115 hp pulse pack trouble

The pulse pack system was very sensitive to stray voltages and spikes. Your motor has an ignition safety circuit that is supposed to protect it from such things. I have heard that the safety circuit is no longer needed on new packs nowadays....I am ignorant concering that question. Yes, your motor is supposed to charge the battery. Your problems may very well be related. You must check EVERYTHING before putting in a new pack. Loose, dirty, corroded connections are the chief culprits, both for knocking out the alternator and the pack.

thanks Rear Admiral for the advice. Would you happen to know what the specs are at either the rectifer, or the battery, volts and/or amps. Im under the impression that this is a battery capacitance discharge, which would mean a low battery will burn the power pack up. Right?

 

[flabum]

Re: 1969 evinrude 115 hp pulse pack trouble

With your tach not working sounds like the charginging system may be at fault spiking your electrical system.

 

[dcbisbee]

Re: 1969 evinrude 115 hp pulse pack trouble

Hey you guys are awsome. flabum. would you first check the rectifier. sounds like im in for a thinking saturday. I have alot of checks to do.

 

[dsinger]

Re: 1969 evinrude 115 hp pulse pack trouble

Take the clipper switch off it eats power packs.

 

[R.Johnson]

Re: 1969 evinrude 115 hp pulse pack trouble

My Rapair catalog states that they will not honor the warranty if their pak is used with the clipper in place. Replacing the coil with a new pak is also recommended. A known good battery is also a must with this system.

 

[dcbisbee]

Re: 1969 evinrude 115 hp pulse pack trouble

What and where is the clipper switch. how does this relate to my problem.

 

[F_R]

Re: 1969 evinrude 115 hp pulse pack trouble

The ignition safety circuit (clipper circuit as these guys are calling it) is a small rectangular box with a yellow wire, a yellow/grey stripe wire, a purple wire, and a purple/black stripe wire, all going to the terminal strip. If you remove it, you will have to reconnect the purple/black wire coming from the pulse pack to the purple wires on the terminal strip in order to get battery voltage feed to the pack.

I have to assume that it's function has been built into the new pulse packs. ????

 

[F_R]

Re: 1969 evinrude 115 hp pulse pack trouble

OK, everybody let's clear this up. It's been 40 years and I got to wondering if my brain is still intact, so I got the factory book out.

1. We are talking about a 1969 115hp here, not necessarily other year/models.

2. It has an "IGNITION SAFETY CIRCUIT", not a "clipper circuit". They are not the same thing. The safety circuit is to prevent ignition before the starter is cranking. It does that by sensing alternator output and when it sees alternator output, it "turns on" the power to the pulse pack. (Purple/black wire).

3. If the safety circuit is not working, you will get no ignition spark.

4. If the alternator is not working, the safety circuit will not turn on the power to the pulse pack and you will get no spark.

5. If the safety circuit is OK, but the alternator is not working, several things could be the cause:
5a. Rectifier
5b. Shift Diodes
5c. Alternator Stator
5d. Tachometer.

TO TEST SAFETY CIRCUIT OPERATION:
1. Check for 12v at the purple wires on the terminal strip with key turned on. If OK,

2. Check for 12v at the purple/black wires while cranking with starter. Should be voltage only when cranking. If no voltage when cranking,

3. Use a jumper wire between purple and purple/black wires on terminal strip. Check to see if you have spark when cranking with starter. If you do, the pulse pack and coil, etc are OK.

BENCH TEST OF SAFETY CIRCUIT
1. Connect a #67 bulb between safety circuit purple/black wire and housing of safety circuit
2. Connect a jumper wire between housing of safety circuit and negative terminal of battery.
3. Connect another jumper wire between purple lead of safety circuit and positive terminal of battery.
4. If bulb lights when above connections are made, safety circuit is defective.
5. Bulb should not light when above connections are made. Touch each remaining safety switch wire (yellow and yellow/grey) separately to the battery positive jumper wire. Bulb must light when either lead touches positive lead or safety circuit is defective.

The alternator must be working in order for the safety circuit to operate. If your alternator is not working, check items listed under 5a through 5c.

Whew! No wonder I had to get the book out.

 

[dcbisbee]

Re: 1969 evinrude 115 hp pulse pack trouble

Thank you for clearing that up for me. i was begining to wonder. ive installed the new pulse pack and have cranked it 3 or 4 times for about 10 secs. no fire at this time. I believe i have a rectifier problem, i stilll have to check. I now need to identify the safety switch on my engine and test as you have said. I dont have alot of time to do, but will keep you posted. Thank you very much for you help. any further tests or specs will help. thanks again.