Grew Limited St170

[wreckingball]

Hello guys ,
I'm new to boating and don't really know all that much, I just bought an 1988 Grew and it has a 115 Mercury on it . The motor runs fine and is connected straight to the battery . My problem is that I have a nest of wiring for the boat ( lights , horn , pump and other accessories) and have no idea what is what . Does anyone have a wiring diagram for this boat ?

 

[GA_Boater]

Welcome aboard.

Your boat is probably suffering from 30 years of prior owners hacking and whacking, then adding stuff to the electrical system with no regard for common sense. :doh:

Wiring is wiring for the most part. I believe AllDodge or Scott Danforth has a generic wiring diagram for a boat, including color codes standards if PO's tried to keep things straight.

 

[Scott Danforth]

[h=2]American Boat and Yacht Council Standards[/h]

Black	Ground	Negative / Neutral Main Return
Blue-Stripe	Tilt up and or trim out	Tilt and or trim circuits
Brown	Alternator Charge Light	Generator Terminal or Alternator Auxiliary Terminal to Regulator
Generator Armature	Generator Armature to Regulator
Pumps	Circuit Breaker or Switch to Pumps
Brown w/Yellow	Bilge Blowers	Circuit Breaker or Switch to Blower
Dark Blue	Cabin & Instrument	Circuit Breaker or Switch to Lights
Green or Green w/Yellow Stripe	Bonding System	Grounding Wires (if insulated)
Green Stripe	Tilt down and/or trim in	Tilt and or trim circuits
Grey	Navigation Lights	Circuit Breaker or Switch to Lights
Tachometer	Tachometer Sender to Gauge
Lt. Blue	Oil Pressure	Oil Pressure Sender to Gauge
Orange	Accessory Feed	Ammeter to Alternator or Generator
Common Feed	Distribution Panel to Accessory Switch
Feed	Accessory Circuit Breakers or Switches
Pink	Fuel Gauge	Fuel Gauge Sender to Gauge
Purple	Ignition	Ignition Switch to Coil & Electrical Instrument
Instrument Feed	Distribution Panel Electrical Instruments
Red	Instrument Feed	Distribution Panel to Electrical Instruments
Power Feeds	Positive Main Power (particularly un-fused)
Tan	Water temperature	Water temperature sender to gauge
Yellow	Generator Field	Generator to Regulator Field Terminal
Ground	Negative / Neutral Main Return
Yellow w/Red	Starting Circuit	Starting Switch to Solenoid

COLOR ITEM USE

 

[alldodge]

Howdy

In most cases it sometimes is best to rip it all out and start over, but in any case, wiring is generic. Get the motor wiring all cleaned up, then decide which is best for you and your budget.

Its best to run new Positive and Negative wires to feed anything that the motor does not need to run. Here is the generic wiring diagram. If you have any specific questions, fire away, will try to help

 

[wreckingball]

Thanks guys, is it bad that the only hooked up to a battery is the ground and power for the motor? have power trim and it is working aswell

 

[alldodge]

What you have is normal for most manufactures. They tap off the Red/Purple feeding the ignition to accessories. This does work so lang as there is only light loads. Not the best way but the cheapest

As for the trim, it is connected on the starter post so no need to change anything with it