In need of wiring diagram & advice

Joined
Sep 6, 2009
Messages
23
OK, back again for more help.. This forum is the best thing to happen to boating since the invention of the oar!

..Anyway, I have decided to remove the "rats nest" that is my boat wiring..Uggh! What a mess! Lights work when they want to and there is a short somewhere in the charging system (I believe) causing the battery to discharge quickly. The positive wire going to the trim motor for example has been spliced several times, it is four different colors of wire!
I want to do it right and to "code". Replace it all from gauges to trim.. ALL of it! I would like to know where I could find a good wiring diagram. The boat is a '66 ,19' Fiberform. Engine is a (as I found out on here) 165 Mercruiser with a Merc 1 outdrive. The original harness going back to the plug on the engine is still in fair shape. The engine compartment is a mess, under the dash is a mess! It all has to go!
I have a SELOC manual with some vague diagrams. Also, while I am doing this, I figure now would be a good time to wire up a dual battery system. Any pointers/ suggestions on that would be appreciated. I have never wired one up before. I want to use an isolator but want to make sure both batteries will be maintained by the alternator. Does anybody know what the amperage output of these alternators are?

By trade, I am an aircraft mechanic so I want to wire up the accessories off the secondary battery, Lights, radios etc.. in the same fashion as an aircraft.. a buss bar, circuit breakers etc.. but first, I want to return the original wiring as it was, as it should be.

Thanks in advance!
 

Fun Times

Moderator
Staff member
Joined
May 16, 2009
Messages
9,149
Re: In need of wiring diagram & advice

This may help as a starting point, Good luck with it.:)
Standard Boat Wiring color Codes.


Blk -Grounds-General
Blk/Brn -Pump Grounds
Blk/Red -Voltmeter Grounds
Blk/Org -Isolated Accessory Grounds
Blk/Yel -ignition stop
Blk/Grn -Water Level Sender Ground
Blk/Blu -Lighting Grounds
Blk/Gry -Nav Light Grounds
Blk/Wht -Battery Parallel Solenoid
Brown -Pumps-General, Bilge or Sump (Manually Switched)(Also alternator starter to Ign.)
Brn/Red -Pumps, Bilge or Sump
Brn/Org -Power feed to Auto Bilge Switches-Pumps, Fuel/Oil Tranfer or Priming
Brn/Yel -Baitwell or Aerator
Brn/Grn -Fresh Water Pump/Water Maker
Brn/Blu -Head Pump
Brn/Vio -Washdown Pump
Brn/Wht -trim pos sender
Red - Battery Feeds Unprotected
Red/Vio -Misc. Accy. Main Feed Protected (fused) from batt to trim panel.
Pink -Fuel Sender
Org/Blk -Audio System Feed
Org/Brn -Electric Head-Sanitation System
Org/Red -Wiper Port
Orange -Accessories common feed- Dist Panel to Acc switch-Anode Electrode-Mercathode
Org/Yel -Diesel Pre-heat
Org/Grn -Wiper Stbd
Org/Blu -Communications Equipment
Org/Vio -Navigation Equipment
Org/Wht -Wiper Center
Yel/Blk -Choke - Neutral saftey trans mounted
Yel/Red -Start Solenoid(starting circut), Neutral Safety
Yel/Org -Powered Ventilation, Fans
Yellow -Bilge Blowers -(also alternator DC output)
Yel/Wht -Rudder Angle Sender
Grn/Red -Stop Solenoid/Kill Switch
Grn/Yel -AC Grounding
Green -Bonding
Grn/Wht -Engine Trim in and or tilt down
Grn/Org -Engine Independent Trim down
Blu/Blk -Cabin Lights
Blu/Brn -Oil Temp Send
Blu/Red -Cabin or Cockpit Lights Port
Blu/Org -Engine Independent Tilt Up
Blu/Yel -Lighting Circuits to Remote Send
Blu/Grn -Cabin or Cockpit Lights Stbd
Blu -Instrument & General Lighting
Blu/Vio -Courtesy, Boarding Lighting
Blu/Wht -Engine Trim Outand/or Tilt Up
Light Blue -Oil Pressure
Vio/Red -Eng. or Generator B+ from Breaker
Vio/Yel -I/O Trim Up (ballast bypass)
Vio/Grn -I/O Trim Down
Vio -12v Ignition-Generator or Engine
Vio/Wht -Trim "Trailer" switch
Gry/Blk -Mast Light
Gry/Red -Spotlight Remote
Gry/Org -Docking Lights
Gry/Grn -Strobe or Beacon
Gry/Blu -Spreader/Flood Lights
Gry/Vio -Windlass/Winch
Gray -Navigation (running) Lights, Tach. Send
Gry/Wht -Anchor Light
Wht/Brn -Temp. Alarm or Indicator
Wht/Red -Fuel Alarm or Indicator -((Ignition module to Dist.)Mercury Thunderbolt Ignition)
Wht/Org -Fire Alarm or Indicator
Wht/Yel -Air Flow Alarm or Indicator
Wht/Grn -Water Press/Flow Alarm or Indicator - ((Ignition module to Dist.)Mercury Thunderbolt Ignition)
Wht/Blu -Oil Press Alarm or Indicator
Wht/Vio -Voltage Alarm or Indicator
White -General Alarm Usage, Yamaha Kill Switch
Tan - Water Temp sender
Tan/Blu -Warning system sense wire (Audio warning)
Pink -Fuel sender
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,148
Re: In need of wiring diagram & advice

Ayuh,.. BT's pretty well got ya covered, so I'll only add that the Motor's wiring diagram is in the Factory Manual, you can find in the Adults Only section of this forum,...
And,...
General boat wiring is covered in the stickies in the electrical forum...
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: In need of wiring diagram & advice

At the very top of this forum is a "sticky" titled Genric Boat Wiring Diagram. Pretty generic but it does not cover the engine. You need the engine manufacturers wiring diagram for that end of the system.
 

mikphilips

Cadet
Joined
May 4, 2010
Messages
18
Re: In need of wiring diagram & advice

Where are the stickies with the wiring info?
Thanks
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: In need of wiring diagram & advice

Go back to the top of the Electrical forum (not your thread). There are three stickies there. Two of them contain wiring diagrams.
 

imraan47

Petty Officer 1st Class
Joined
Sep 18, 2009
Messages
315
Re: In need of wiring diagram & advice

check out my post too..but then again you probably know alittle more for the general diagrams i was given from this site by members.
g'luck
 
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