86 140 Looper not charging has tach

[scuba4me]

I have been doing some troubleshooting via the OEM manual but no luck. 140 Evenrude 1986 looper I had a charging issue when I got the boat it had no tach and the previous owner had reversed the battery cables. I replaced the rectifier and power pack and that solved it.

This time I changed out the controls with same but better condition ones and in the process the fuse in the motor blew somehow. I dont think I did anything wrong. The fuse was old and rusty. I replaced the fuse connector, fuse, and the starter solenoid at that time. Since then I have no charge at all just battery power.

What would cause the fuse to blow and what part would that likely effect? What would be the likely part that would allow the tach to work, but not the charging system? The stator looks fine seems like something happened when I redid the controls. Motor runs and starts fine has tach but just no charging. Would the power pack or the rectifier blow in a way the tach would work but the charging would not? Any pointers or what to check for would be a big help right now.

Thanks

 

[Daviet]

Re: 86 140 Looper not charging has tach

Sounds strange, did you find out what blew the fuse.
I would recheck the rectifier and see if it is OK.

 

[scuba4me]

Re: 86 140 Looper not charging has tach

delete

 

[scuba4me]

Re: 86 140 Looper not charging has tach

Sounds strange, did you find out what blew the fuse.
I would recheck the rectifier and see if it is OK.

I was working on the controls it might have been something I did when rewiring (did not disconnect battery duh). My suspect is the rectifier but the manuals instructions are not very good is there a simple way to check with a basic meter. I thought that the tach would stop working if it was the rectifier is that not always the case?

Thank You.

 

[Barnacle_Bill]

Re: 86 140 Looper not charging has tach

The rectifier can be bad and the tach still work. It all depends on what diode(s) blow.

 

[Dawgs]

Re: 86 140 Looper not charging has tach

I just went through the same thing. Rectifier was bad

Another member gave me this site. It has all your answers

ISSUU - CDI Electronics Practical Outboard Ignition Troubleshooting by CDI Electronics

 

[scuba4me]

Re: 86 140 Looper not charging has tach

I hate to buy and pray but I just did. I have a feeling it’s the rectifier.

 

[Joe Reeves]

Re: 86 140 Looper not charging has tach

Does the engine have the small 3 wire rectifier... OR the water cooled one on top of the powerhead?

 

[scuba4me]

Re: 86 140 Looper not charging has tach

Its the water cooled one I think it sits under the plastic cover top back of the motor. 90$ shipped if thats not it Ill have a spair and have to pay someone to look at it.

 

[scuba4me]

Re: 86 140 Looper not charging has tach

So I took it all apart and the two red wires one small and one big on the port side of the wire harness for the rectifier were corroded. The nut fell off and the smaller wire was corroded to a point it was not connected. I stripped the two wires and reconnected them after I drilled out the old screw. This is most likely my problem right?

I haven’t put the new rectifier in going to take the boat out and test it this weekend. Is that big red wire the one that charges the batteries? Does that wire harness do anything but hold the two wires together ungrounded?

 

[scuba4me]

Re: 86 140 Looper not charging has tach

I know the silence = RTFM I see the red wires that go to the solenoid are the charging part I need to get it on the water to test but I think this was all there was to it. I didn’t even unbox the rectifier hopefully they will take it back or I’ll keep it as the existing one doesn’t look so good kind of worried about removing the retaining screws for the rectifier they look a little frozen now if you know what I mean...
Thanks for the help and suggestions for sure its the rectifyer or just a wire fix I belive.

 

[Joe Reeves]

Re: 86 140 Looper not charging has tach

Hopefully you've found the problem and corrected it. However, the gray wire leading form the engine wiring harness is the tachometers sensor lead... is this gray wire attached to the reg/rec gray lead or to one of the stator's yellow wires?

 

[scuba4me]

Re: 86 140 Looper not charging has tach

Hopefully you've found the problem and corrected it. However, the gray wire leading form the engine wiring harness is the tachometers sensor lead... is this gray wire attached to the reg/rec gray lead or to one of the stator's yellow wires?

It’s all closed up right now so I can see Ill look and reply back. But the tack is working and so was the charging at one point. I started it on the ears and reved a little and the volt meter moved a little (that was snot happing before) so I’m hopeful its fixed.

Additional related question: Will the motor run on its own once started like other 2 strokes if the charging system is not working? Let’s say the charging was not working and the battery was drained or disconnected while I was running would this stop the motor or cause any harm with no charging system?

 

[schematic]

Re: 86 140 Looper not charging has tach

Let’s say the charging was not working and the battery was drained or disconnected while I was running would this stop the motor or cause any harm with no charging system?

Ignition is totally separate from Charging system. It is never a good idea to disconnect a battery while running, especially if its a regulated charging system as regulator damage can result.(just to further the conversation)

 

[scuba4me]

Re: 86 140 Looper not charging has tach

Ignition is totally separate from Charging system. It is never a good idea to disconnect a battery while running, especially if its a regulated charging system as regulator damage can result.(just to further the conversation)

I guess my real question is say I?m only running the motor no electronics ext. how much will the motor drain the battery if it?s not charging it?

The reason I ask is I have two batteries. I 100% slow charge both before going fishing. Last time I was out my electronics gave a low voltage warning when it hit 11v (Perco set to All). Just curious how the discharging batterys would affect the motor i.e. will it quit on me once its running and the voltage in the battery drops too a certain point? I have the switch set to All I was thinking should probably set it to 1 and save the other battery or does it matter?

 

[schematic]

Re: 86 140 Looper not charging has tach

I guess my real question is say I’m only running the motor no electronics ext. how much will the motor drain the battery if it’s not charging it?

In that case, it will only drain while cranking.

Just curious how the discharging batterys would affect the motor i.e. will it quit on me once its running and the voltage in the battery drops too a certain point?

It won't quit. But if the battery gets too low, you may not be able to restart.

I have the switch set to All I was thinking should probably set it to 1 and save the other battery or does it matter?

It is never a good idea to set to "All" unless motor is running and the charging system is working, or, if you are charging with an external charger.

If you charge a good battery to a full state of charge, it will likely power your starting system all season without recharge. Not a good idea to leave uncharged for so long, but will work.

If you recharge your batteries after every time out.....you don't even need a charging system.

 

[scuba4me]

Re: 86 140 Looper not charging has tach

Ok thanks a lot that fully answers all my questions about the charging vs running. Hopefully the issues resolved otherwise Ill be replacing the rectifier.

 

[scuba4me]

Re: 86 140 Looper not charging has tach

So I replaced the rectifier last weekend and had full charging. Thursday I replaced my radio and charged the battery. Friday I went out and no charging again. I looked at it today and can’t find anything wrong (other than its not charging). Is it possible that charging my battery killed another rectifier? What would be causing this type of issue? I figure it must be the rectifier again as thats what fixed it last weekend. I don’t want to put another one in without figuring out whats causing it to fail. Any suggestions?