1977 mercury control box - universal key installation question

B

boydog40

Petty Officer 2nd Class
Joined
May 15, 2005
Messages
125
key switch is bad, dealer recommended installing an external universal switch - heres my problem
have the following wires in the MERCURY wiring harness
red
orange
white
brown
yellow
black

new key switch has the following markings:
"B"
"M"
"S"
"A"
"M"

what wire goes where????
thanks!
 
M

Moody Blue

Captain
Joined
May 24, 2004
Messages
3,136
Re: 1977 mercury control box - universal key installation question

Don't have quick access to my manual but I can offer this if it helps.

B = Battery
M = Magneto
S = Start
A = Accessory
M = Magneto

What motor is connected to the controller?
 
B

boydog40

Petty Officer 2nd Class
Joined
May 15, 2005
Messages
125
Re: 1977 mercury control box - universal key installation question

70 hp
i know red is battery
black is ground
yellow is starter
but think i need 2 grounds to shut it off right?
do i jump the ground from one to the other?
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,616
Re: 1977 mercury control box - universal key installation question

Here ya go..
B= red
M= orange
S=yellow
A= white
M=black
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,142
Re: 1977 mercury control box - universal key installation question

Grey is choke.....
 
B

boydog40

Petty Officer 2nd Class
Joined
May 15, 2005
Messages
125
Re: 1977 mercury control box - universal key installation question

got it!!! thanks and it works perfectly!!!
thanks again guys!
 
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