Mercury V-8 888 302 ford 5.0 L 1974 question

[Pirate01]

I came across this site searching for instrument panel wiring diagram. I found an old post with some expired links. We have a manual for this engine but the diagram shows 10 wires and our engine has 9 on the instrumental panel. Our serial number is 3852802. If anyone has the diagram for this could you post the link please. We are trying to install a new ignition switch for the project boat we purchased had no switch.

 

[alldodge]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

:welcome: to iboats

Have a look here and lets us know if it helps
http://l-36.com/manuals9/merc_elecs.pdf

 

[Pirate01]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

same problem we have 9 wires not 10 and engine is 302 5l not 7.5l

 

[alldodge]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

same problem we have 9 wires not 10 and engine is 302 5l not 7.5l

Not a 7.5L .... What does that mean?
Almost every page is showing 9 wires, only ones that don't are EFI models have 10 wires. If it is a 4, 6 or 8 cylinder they all have 9 wires, what's missing?

 

[Bondo]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

I came across this site searching for instrument panel wiring diagram. I found an old post with some expired links. We have a manual for this engine but the diagram shows 10 wires and our engine has 9 on the instrumental panel. Our serial number is 3852802. If anyone has the diagram for this could you post the link please. We are trying to install a new ignition switch for the project boat we purchased had no switch.

Ayuh,.... Welcome Aboard,....... Yer switch ain't got 9 wires,..??

Right here at the top of the Electrical forum are some wirin' diagrams, that oughta cover yer ignition switch install,...

 

[Pirate01]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

yes you are right !!!! it works for me thank you very much!!!

 

[Pirate01]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

Ayuh,.... Welcome Aboard,....... Yer switch ain't got 9 wires,..??

Right here at the top of the Electrical forum are some wirin' diagrams, that oughta cover yer ignition switch install,...

no not a switch ))) thank you

 

[alldodge]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

no not a switch ))) thank you

I don't think I've ever gotten this way on a forum but...
This is Not a switch, not a wiring harness, then what the heck is it

 

[Pirate01]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

Update - We thank you, AllDodge for the link to the diagrams, we downloaded and printed them and compared to the wires we have unfortunately the diagrams included in the file do not fully correspond to what we have. We have 2 purple wires,brown, white, grey, blue, a thick orange, thick red and thick black wired coming from engine to instrument panel. The instrument panel also differs from the one on the diagram in that it lists a oil pressure gauge whereas our does not have one. From left to right we have water temp, tach, volts, hours, mph, fuel. And from red its only 8.5 volts not 12 If anyone has a more specific diagram it would be very helpful and appreciated.

 

[Pirate01]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

Its a wiring harness

 

[Boatdoc58]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

What colors are your wires ? WHat gauge are the wires ? Mercury has bee using the marine standard for wire color/hook up forever. To locate what hooks to what go back to the engine and find, oh say, the lt. blue wire (most likely hooked to the oil pressure sender) unhook it and use an ohm meter on each end to verify that you have the correct wire...this wire will go to the oil pressure gauge.
AllDodge do you think the tenth wire is the one that tees off and goes to the tilt/trim switch and never makes it to the inst. panel ?

 

[alldodge]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

AllDodge do you think the tenth wire is the one that tees off and goes to the tilt/trim switch and never makes it to the inst. panel ?

It's possible, because nothing seams to be adding up. Just need to wait and see what other info comes to help clarify

 

[Pirate01]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

It's possible, because nothing seams to be adding up. Just need to wait and see what other info comes to help clarify

Hello thank you we are going to install the ignition key/switch into the control panel. We found wire cluster that is to be connected, neatly bundled wth a zap-strap. We searching all over everywhere for a diagram that is specific to our boat or some way to find out how to properly connect circuits so we dont have to do "anyhow" like we stealing it. The switch came with a diagram explaining where its 6 connections are to be used for. Problem is the bundle of wires in our hands is such a mystery. We really appreciate any advice. Thanks.

 

[alldodge]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

Hello thank you we are going to install the ignition key/switch into the control panel. We found wire cluster that is to be connected, neatly bundled wth a zap-strap. We searching all over everywhere for a diagram that is specific to our boat or some way to find out how to properly connect circuits so we dont have to do "anyhow" like we stealing it. The switch came with a diagram explaining where its 6 connections are to be used for. Problem is the bundle of wires in our hands is such a mystery. We really appreciate any advice. Thanks.

Can you take some pics of what your looking at?

 

[Bondo]

Re: Mercury V-8 888 302 ford 5.0 L 1974 question

Update - We thank you, AllDodge for the link to the diagrams, we downloaded and printed them and compared to the wires we have unfortunately the diagrams included in the file do not fully correspond to what we have. We have 2 purple wires,brown, white, grey, blue, a thick orange, thick red and thick black wired coming from engine to instrument panel. The instrument panel also differs from the one on the diagram in that it lists a oil pressure gauge whereas our does not have one. From left to right we have water temp, tach, volts, hours, mph, fuel. And from red its only 8.5 volts not 12 If anyone has a more specific diagram it would be very helpful and appreciated.

Ayuh,....If yer talkin' 'bout the whip that comes from the cannon plug on the motor, look in this manual for the wirin' diagrams,...

It covers the Merc's of yer vintage,...

'n if yer only gettin' 8.5v on the big red wire, ya got a problem Up-stream,...
Start at the battery, 'n work forward,...