wiring 70 hp johnson 1987

[Ram_Boat]

Would anyone have an accurate wiring diagram of a 70 hp johnson 1987?
I just bought it rebuilt and will use a seastar control and ignition switch. The 2 online manuals I bought have errors on just about everything. No luck on the web. Original shop manual on it's way but 2 - 3 weeks to get to me.

[flabum1017]

The wire colors at the dash should be:

Red - 12V positive
Black - 12V Negative
Black/Yellow Stripe - Ignition Kill
Purple - 12V Positive with Ignition On
Blue/White Stripe - Choke/Primer
Yellow/Red Stripe - Start
Gray - Tachometer Signal

The trim Harness will be:

Red -12V Positive to switch
Blue - Up Circuit to switch
Green - Down Circuit to switch
Brown - Trim Sender
Black - Trim Sender Ground

[Ram_Boat]

Thanks for the fast reply. All colours match on the motor.

Next question:

It should look like this on my switch?
Provide + for gauges from pin A
Neg from first pin M
Ground Black/Yellow Stripe - Ignition Kill from 2nd M pin.


B = Red - 12V positive
M = Black - 12V Negative
2nd M = Black/Yellow Stripe - Ignition Kill
A = Purple - 12V Positive with Ignition On
C = Blue/White Stripe - Choke/Primer
S = Yellow/Red Stripe - Start
Outside my switch to rpm gauge = Gray - Tachometer Signal

[flabum1017]

Yes.... you got it......