Need of wiring diagram!!

T

trihull59

Seaman Apprentice
Joined
Jul 18, 2010
Messages
46
I have a Mercury thunderbolt 850 and im switching over parts from a older 850 and noticed there are differences like the coil and carbs and other things so i am looking for a wiring diagram so i can figure out how to hook up everything. Serial number is 4101442 Mercury Thunderbolt 850
Thanks in advance!
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,142
Re: Need of wiring diagram!!

Take a look at the maxrules.com website. Most any diaghram for a motor with distributor ignition will be very close to yours.
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,142
Re: Need of wiring diagram!!

BTW - The carbs and other non-ign parts are interchangeable.
 
T

trihull59

Seaman Apprentice
Joined
Jul 18, 2010
Messages
46
Re: Need of wiring diagram!!

oh and my serial number is not listed on that website any other sites thanks!
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,142
Re: Need of wiring diagram!!

If they are both battery/distributor CDI ign motors, the switchbox and coil are interchangable. The one with the serial number you gave likely has that kind of ign. What kind of ign does the other have? Can you describe it?
 
T

trihull59

Seaman Apprentice
Joined
Jul 18, 2010
Messages
46
Re: Need of wiring diagram!!

the other motor is a 73' mercury outboard 850 thunderbolt ignition
the coil looks a lot bigger on the 73 then it does on the newer motor but the switch boxes are identical the other serial number is 349 something i cant remember it off the top of my head
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,142
Re: Need of wiring diagram!!

Yeah, Those '73 850 had the big ugly red coil, and big ugly rectifier. The newer ones (heart shaped coil in grey metal box, and three terminal black chicklet-shaped rectifier) will work with the dist and switchbox.
 
T

trihull59

Seaman Apprentice
Joined
Jul 18, 2010
Messages
46
Re: Need of wiring diagram!!

wait so i can or i cant use the rectifier and coil on the other motor? lol
 
You must log in or register to reply here.
Top