40 merc what does rectifier do

[buzzman]

did OHMS test it showed bad,not very smart on this item

choke will not operate could this be problem sense rectifier wire goes to throttle

 

[Nandy]

Re: 40 merc what does rectifier do

The rectifier will work to charge your battery. I doubt it will cause your choke not to work.

 

[1730V]

Re: 40 merc what does rectifier do

I'm not a big Merc guy. However, the rectifier turns AC electrical current into DC current for charging the battery. It may very well be connected to the choke circuit.

 

[Barnacle_Bill]

Re: 40 merc what does rectifier do

What year motor is it? The rectifier has nothing to do with the choke.

 

[1730V]

Re: 40 merc what does rectifier do

"The rectifier has nothing to do with the choke."

Not arguing but it could if there is a short and that circuit "popped" the rectifier. I'm not a fan of old Merc wiring.

The guy needs a manual.

 

[buzzman]

Re: 40 merc what does rectifier do

thanks for info i do have a manuel it is a clymer a piece of ****, my 9 year old could make a book this good.
in manuel it has a wire from rectifier to choke
put new choke silinoid in
put radio shack rectifier in few minutes a go

 

[buzzman]

Re: 40 merc what does rectifier do

1979 mercury 402 40 hp
any quick way to check choke
could it be in key switch

 

[Barnacle_Bill]

Re: 40 merc what does rectifier do

1979 mercury 402 40 hp
any quick way to check choke
could it be in key switch

If you have a push to choke switch then yes it could be in the switch. None of my manuals cover your motor so I'm not sure of the wiring color code. Some used gray and some yellow/black to the switch. You will have to check your manual to see what color wire goes from the choke to the switch. Then with the key on, push it in and you should have 12V on that wire. A quick check would be to listen at the motor for a click while some one pushes the key in.

 

[buzzman]

Re: 40 merc what does rectifier do

thanks it is a gray wire i do not get any voltage off other end
any secrets to breaking shift case toget to switch

 

[Barnacle_Bill]

Re: 40 merc what does rectifier do

thanks it is a gray wire i do not get any voltage off other end
any secrets to breaking shift case toget to switch

Sorry, can't help you with that. Hopefully someone else can. The back of manuals usually have the controls in them. If you can figure out what they are telling you. LOL