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If your Mfgr. says:

That motor's 7 years old.
Part is no longer available.
We lose $$ on service!
EPA made me do it!
Parts at central warehouse, you'll get them next month.
We don't make parts for those.
We only do warranty work.
Our techs only fix late models.
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MERCURY WIRING DIAGRAMS

The linked images are printable but may print across
more than 1 page (in order to be legible). Most models also have black-&-white-only
PDF files which will print the correct size on a standard sheet of paper
but require Adobe Acrobat or compatible PDF reader to open. Most diagrams are only listed
as PDF for the moment but all will eventually have color versions posted.

Merc Models thru 1965
350 (2cyl)........MercElectric Ext. Harness.(page bottom.)     (PDF)
350 (2cyl).........MercElectric Int. Wiring Diagram     (PDF)
All
4 Cyl. (2 Lever control)........Ext. Harnesses A29645, A39125     (PDF)
All
4 Cyl. (1 lever control)........Elect. Starter Wiring Diagram     (PDF)
600-700-800 (Direct Reversing)......Int. Harness Connector (page top)     (PDF)
600-700-800 (Direct Reversing).......Elect. Starter & Ext. Harness     (PDF)
700-800-850 (Full Gear Shift)........Int. Conn. Color Code.(page top)     (PDF)
700-800-850* (Full Gear Shift).........Starter Wiring & Ext. Harness     (PDF)
          
(*note: some use Merc 1000 type ignition system below)
700-800-850-1000 (Full Gear Shift)...Starter Wiring & Ext. Harness     (PDF)
950-1100.........Wiring Diagram & Ext Harness     (PDF)
950SS-1100SS.......Wiring Diagram & Ext. Harness     (PDF)
Mark 25E (Positive Ground)........Wiring Diagram     (PDF)
Mark 25E (Negative Ground)........Wiring Diagram     (PDF)
Mark 50E-55E (Postive Ground).....MercElectric Starting Wiring     (PDF)
Mark 75-78.........Internal & External Harness     (PDF)
Mark 75-78 (Elect. Starting).......Wiring Diag. & Ext Harness     (PDF)
Mark 75A-78A..........Electric Starter Wiring Diag. & Ext. Harness     (PDF)
Mark 75A-78A...........Internal Harness Connector (page bottom)     (PDF)
MercElectric Switches..........Ignition & Starter Types     (PDF)
1966 and newer
Merc 7.5 & 9.8 (1979-UP)..........Ignition Wiring  Rope Start  (IMAGE)
Merc
7.5 & 9.8 (1979-UP)..........Ignition Wiring  Electric Start  (IMAGE)
Merc
200 (1970-71)..........Internal & External Wiring   (IMAGE)  (PDF)
merc
200 (1972).............Internal & External Wiring     (PDF)
Merc
200 (Breakerless Ignition)..........Internal & (2)External Wiring Diagrams     (PDF)
Merc
200..........Internal & External Wiring Diagram     (PDF)
Merc
350 (MercElectric-2 Cyl.)........Internal & External Wiring Diagram     (PDF)
Merc
400 (2 Cyl.)..........Internal & External Wiring Diagram     (PDF)
Merc
402 (2 Cyl.)..........Internal & External Wiring Diagram     (PDF)
Mercury 4 Cylinder (Magneto).........Internal & External Wiring Diagram    (IMAGE)     (PDF)
Merc
45-50 (4-cyl) .....................Internal & External Wiring Diagram thru 1979 Rope Start   (IMAGE
Merc 45-50 (4-cyl) ..................... Wiring Diagram 1980-UP ROPE Start   (IMAGE)
Merc 45-50 (4-cyl) ..................... Wiring Diagram 1980-UP Electric Start   (IMAGE)
Merc
500 Thunderbolt..........Internal & External Wiring Diagram    (IMAGE)   
Merc
500 CD ignition 1976-78 Electric Start..........    (IMAGE)   
Merc
500 CD ignition 1976-78 Rope Start..........    (IMAGE)   
Merc
500S-650S (Breakerless).........Internal & External Wiring w/Ignition Driver    (IMAGE)     (PDF)
Merc
500SS-650SS (Breakerless).........Internal & External Wiring Diagram   (IMAGE)    (PDF)
Merc
650 (3 Cyl.)..........Internal & External Wiring Diagram     (IMAGE)    (PDF)
Merc
650-(800*)-850 Thunderbolt.......Internal* & External Wiring     (IMAGE)    (PDF)
        (* serial #'s 2991033-below; 3052381-3059821; and 3307347-up)
Merc
800* Thunderbolt.........Internal & External Wiring  (IMAGE)    (PDF)
       (*serial #'s 3051041-3052380 & 3144219-3192962)
Merc
950-1100.........Internal & External Wiring Diagram   (IMAGE)     (PDF)
Merc
950SS-1100SS........Internal & External Wiring Diagram   (IMAGE)     (PDF)
Merc
950-1000-1100-1250 (Breakerless).....Internal & External Wiring Diagram     (IMAGE)     (PDF)
Merc
1150-1350-1400-1500 Thunderbolt.....Ignition & External Wiring Diagram     (IMAGE)      (PDF)
MercElectric Switches........Starter & Ignition types thru 1969      (IMAGE)
Merc Model
900-1150-1500........1976-78 Wiring Diagram       (IMAGE)
Merc Models
50, 70, 90 3-Cylinder 1980's    (IMAGE)
Merc Model
70 HP........thru Serial # 5579016 Wiring Diagram       (IMAGE)
Merc Model
70 HP........from Serial # 5579017 Wiring Diagram       (IMAGE)
Merc Model 75 HP........from Serial # 6432901 Wiring Diagram       (IMAGE)
Merc 80 (4-cyl) .....................Internal & External Wiring Diagram S# 4391999 -5582561   (IMAGE
Merc 80 (4-cyl) .....................Internal & External Wiring Diagram S# 5582562-6432900   (IMAGE
Merc Model
90 HP -115 HP -140 HP.......1979 ONLY Wiring Diagram     (IMAGE)
Merc Model
90 HP -115 HP -140 HP.......1980 (Ser. 5594657) & up Wiring Diagram     (IMAGE)     (PDF)
Merc V6.......... Models ser # 4301235 to 5129480      (IMAGE)
Merc V6 Models
150 HP, 175 HP & 200 HP ser # 5124981 to 5363918     (IMAGE)
Merc V6 Models
150 HP, 175 HP & 200 HP ser # 5363919 to 5464484     (IMAGE)
Merc V6
135 1985-88, 150 1979-88, 175 1980-88, 200 1979-88, 220 CARB 1986-88   (IMAGE)
 
 

Please review our Warranty, Returns & Refunds policies before you place an order.

DISCLAIMER

The information provided on these pages is correct to the best of my knowledge, however the MasterTech makes no warranty, express or implied, regarding the use of, results of, or liability created from, application of this data. This information is disseminated in good faith, however MasterTech assumes NO LIABILITY whatsoever in regard to this service. The information, software, products, and services published on this web site may include inaccuracies or typographical errors. Changes are periodically added to the information herein. Mastertech may make improvements to this site at any time. Parts ordered from this website may or may not be in dealer stock at the time of order. Thank you for reading.