mercruiser 140 wiring

the_dave85

Cadet
Joined
Aug 5, 2005
Messages
7
my old merc 120 died and a friend gave me a old 140 that i am installing in my boat. i'm not sure the year. i think it is 70's. serial # is 3354343. but i can't figure out how to wire my ignition switch and all my gauges. if anyone has a diagram or knows what colors go where that would be of great help. the wires that come out of the harness are:<br /><br />red- 10 gauge<br />red/white- 10 gauge<br />black- 10 gauge<br />yellow- 14 gauge<br />white- 16 gauge<br />brown- 16 gauge<br />orange- 16 gauge<br />green- 16 gauge<br />thanks for any help
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: mercruiser 140 wiring

Here is the wiring diagram for the 120 and 140 engines both are within the serial number range of the one you posted.<br />Go to the link below and copy it to your computer, it's 804KB, and puts me over my limit of free storage. Let me know when you have it so I can delete it from my site and not get charged for it.<br /><br />Good Luck.
 

the_dave85

Cadet
Joined
Aug 5, 2005
Messages
7
Re: mercruiser 140 wiring

ok i got it thank soo much. maybe i will get out on the lake this summer! thnks again don
 
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