2.5l 1977 marquise 16ft tach trouble and engine trouble

1

1977 marquise

Cadet

Joined

May 16, 2013

Messages

20

• May 21, 2013

• #1

So my tach is goin crazy sometimes and after about 30 mins on the water the boat cuts off and has no spark..changed the condensor but havent had it back on the lake again..anyone know about tach wiring or had this problem before?? Please help!

 

Don S

Honorary Moderator Emeritus

Joined

Aug 31, 2004

Messages

62,321

• May 21, 2013

• #2

Re: 2.5l 1977 marquise 16ft tach trouble and engine trouble

The tach is probably shorting out inside and causing both problems. When it shorts to ground, it kills the ignition. You can disconnect the tach and run it and see if it dies, I suspect it won't, but then you know for sure.

Replace the tach and go boating.

 

1

1977 marquise

Cadet

Joined

May 16, 2013

Messages

20

• May 21, 2013

• #3

Re: 2.5l 1977 marquise 16ft tach trouble and engine trouble

Where does the wires hook up to on the engine? And where do i unhook it at..

 

Don S

Honorary Moderator Emeritus

Joined

Aug 31, 2004

Messages

62,321

• May 21, 2013

• #4

Re: 2.5l 1977 marquise 16ft tach trouble and engine trouble

Gray wire on the - terminal of the coil. Or you can take it off the back of the tach.

 

1

1977 marquise

Cadet

Joined

May 16, 2013

Messages

20

• May 21, 2013

• #5

Re: 2.5l 1977 marquise 16ft tach trouble and engine trouble

Theres is 2 brown wires and the wire goin to the distributer..is it obe of the brown ones or both?

 

Don S

Honorary Moderator Emeritus

Joined

Aug 31, 2004

Messages

62,321

• May 21, 2013

• #6

Re: 2.5l 1977 marquise 16ft tach trouble and engine trouble

Forgot about the color code change.
1 brown goes to the tach, the other goes to the shift interrupt switch.

 

1

1977 marquise

Cadet

Joined

May 16, 2013

Messages

20

• May 21, 2013

• #7

Re: 2.5l 1977 marquise 16ft tach trouble and engine trouble

 

Eric 3.7LX Alpha 1

Captain

Joined

Mar 27, 2010

Messages

3,008

• May 21, 2013

• #8

Re: 2.5l 1977 marquise 16ft tach trouble and engine trouble

Your wires are spliced together at the coil, so disconnect it behind the tach and tape the wire up temporarily so it won't touch anything, will/should be on the "S" terminal.

Will be easier to leave the coil alone.

 

1

1977 marquise

Cadet

Joined

May 16, 2013

Messages

20

• May 21, 2013

• #9

Re: 2.5l 1977 marquise 16ft tach trouble and engine trouble

I just cut the wires found the tach wire and cut it clean. I attached the other wire then took the dash apart and unhooked the tach..hopefully that'll be the problem..

 

Don S

Honorary Moderator Emeritus

Joined

Aug 31, 2004

Messages

62,321

• May 21, 2013

• #10

Re: 2.5l 1977 marquise 16ft tach trouble and engine trouble

1977 marquise said:

I just cut the wires found the tach wire and cut it clean. I attached the other wire then took the dash apart and unhooked the tach..hopefully that'll be the problem..

Click to expand...

One end or the other is all that was necessary.

 

1

1977 marquise

Cadet

Joined

May 16, 2013

Messages

20

• May 21, 2013

• #11

Re: 2.5l 1977 marquise 16ft tach trouble and engine trouble

Could a starter solenoid also cause this? The boat sat for a few weeks and ehen i tried to crank it up the starter got to hot and it just started clicking..let it cool down and it worked again so i didnt think nothing of it

 

Don S

Honorary Moderator Emeritus

Joined

Aug 31, 2004

Messages

62,321

• May 21, 2013

• #12

Re: 2.5l 1977 marquise 16ft tach trouble and engine trouble

No.