Mercruiser 140 '72-79 Alternator and something else question

[Lars0ne]

Alright so i have a mercruiser 3.0 oldschool that i'm rebuilding. I stumbled upon something that i have no guess what it's for. The shift cable attaches to it and it has some kind of hydrlic connection. It looks like a switch. It's placed on the same bracket as the gear killswitch but almost 10inches to the side of that one. I Will put a picture of it aswell.



Next question is how to hook up my alternator since i have no idea what to connect where. I need all the input i can get. Previous owner gave me 2 of alot some working some not working. Some stuff for chevy van and some for ? tractor. I have rebuilt the engine and the alpha outdrive from what was in the boxes. I even took all the lifters apart.

Damn, need to upload pics via computer.

 

[Bondo]

Re: Mercruiser 140 '72-79 Alternator and something else question

Alright so i have a mercruiser 3.0 oldschool that i'm rebuilding. I stumbled upon something that i have no guess what it's for. The shift cable attaches to it and it has some kind of hydrlic connection. It looks like a switch. It's placed on the same bracket as the gear killswitch but almost 10inches to the side of that one. I Will put a picture of it aswell.



Next question is how to hook up my alternator since i have no idea what to connect where. I need all the input i can get. Previous owner gave me 2 of alot some working some not working. Some stuff for chevy van and some for ? tractor. I have rebuilt the engine and the alpha outdrive from what was in the boxes. I even took all the lifters apart.

Damn, need to upload pics via computer.

Ayuh,... Welcome Aboard,... The contraption mentioned in yer 1st paragraph is the shift switch, the reverse-lock, 'n trim indicator...

As for the Alternator,... We're gonna need pictures, as We have No idea what this is, other than older than dirt...

For the pictures,... There's threads explainin' it at the top of the Tech, Non-boatin' forum...

 

[Lars0ne]

Re: Mercruiser 140 '72-79 Alternator and something else question

just needed to switch from phone to computer.

ok the shift-switch-reverse-lock-trimindicator is that a 3 in one type of thingie? whats is hooked up to it?

sorry if im stupid but the harness is cut off and probably not original and everything else was taken apart and double. and not the same.
this is like a giant puzzel.

 

[Bondo]

Re: Mercruiser 140 '72-79 Alternator and something else question

just needed to switch from phone to computer.

ok the shift-switch-reverse-lock-trimindicator is that a 3 in one type of thingie? whats is hooked up to it?

sorry if im stupid but the harness is cut off and probably not original and everything else was taken apart and double. and not the same.
this is like a giant puzzel.

View attachment 156266View attachment 156267

Ayuh,... The 1st picture is part of the shift interrupt switch,... The part with the fittings is the reverse-lock...
I don't see the rest of what I was thinkin' 'bout...

The shift cables hook to their spots, 'n the return hyd. line runs through the valving part...

 

[Lars0ne]

Re: Mercruiser 140 '72-79 Alternator and something else question

the shift interrupt switch is that the one that cuts the engine quick while shifting? think that is to the right outside of this pic.

the reverse lock is that one giving the trimpump a signal when in reverse so that the trim cylinders holds the outdrive down?
puting pressure on the trim cylinders?



the alternator studs marking from bottom in pic; 1 bat 2 gro 3 r 4 f or something like that.

 

[Bondo]

Re: Mercruiser 140 '72-79 Alternator and something else question

the shift interrupt switch is that the one that cuts the engine quick while shifting? think that is to the right outside of this pic.

the reverse lock is that one giving the trimpump a signal when in reverse so that the trim cylinders holds the outdrive down?
puting pressure on the trim cylinders?



the alternator studs marking from bottom in pic; 1 bat 2 gro 3 r 4 f or something like that.

Ayuh,... For shiftin' Outa gear,...

Ya, holds the drive down in reverse...

'n the Bat. goes on the starter's main battery post... other's I ain't so sure... somebody'll know...

 

[Lars0ne]

Re: Mercruiser 140 '72-79 Alternator and something else question

Thanks for your help. 2 things less to identify.

Anyone else who knows a bit bout alternators? Need help. Please.

 

[achris]

Re: Mercruiser 140 '72-79 Alternator and something else question

Sorry guys, that is not the shift interrupt switch, it's the trim system reverse lockout switch.... It stops the pump being run UP while in reverse. Later model pumps don't need it because that have internal valving to allow for UP in reverse, but the older ones didn't. If you hit trim UP with a bit of throttle on in reverse, the leg shoots all the way up....

That alternator is older than Methuselah, toss it and buy a brand new one... Any one of these will do the job, just a question of how much current you want -> http://www.dbelectrical.com/casearch.aspx?query=-69729&x=0&y=0

Chris........

 

[Bondo]

Re: Mercruiser 140 '72-79 Alternator and something else question

]Sorry guys, that is not the shift interrupt switch, it's the trim system reverse lockout switch.... [/B]It stops the pump being run UP while in reverse. Later model pumps don't need it because that have internal valving to allow for UP in reverse, but the older ones didn't. If you hit trim UP with a bit of throttle on in reverse, the leg shoots all the way up....

That alternator is older than Methuselah, toss it and buy a brand new one... Any one of these will do the job, just a question of how much current you want -> http://www.dbelectrical.com/casearch.aspx?query=-69729&x=0&y=0

Chris........

Ayuh,... Isn't the interrupt switch on that same plate, just outa the picture,..??

If not,... I've got 1 or 2 in the garage that Do have both, on the same plate...

 

[achris]

Re: Mercruiser 140 '72-79 Alternator and something else question

Ayuh,... Isn't the interrupt switch on that same plate, just outa the picture,..??...

Correct-a-moondo.... Bond-o... I just had to get that in...

But I do believe he specifically photoed only the reverse lock valve/switch and was asking about that.... Sorry, I'm a pedantic sod...

Chris........

 

[Lars0ne]

Re: Mercruiser 140 '72-79 Alternator and something else question

Haha thanks guys we'll see if the alternator is Alive or if i'll buy ? new one. I'll probably post ? Nice little summery of all i've done later on. Thanks again