Mercury 75hp 2stroke 2006 ignition fault ?

[304]

Hi all . I’ve recently purchased a boat with the above engine on .The broker didn’t really go through the process of starting procedure,my fault as thought it would be straight forward . Before purchase the engine did have a problem with the tilt / hydraulic ram but this turned out to be a wiring connection problem apparently. The battery needed a good charge which now has been done and I tried out ram and all good .Turned on ignition and all instrument lights came on with gauges all working. Yesterday I wanted to move boat out of garage and no ignition cluster lights came on and ram not working ? There is 12v power to starter motor and also to aux equipment like radio and bilge etc . Not sure what to do next I assume power goes to engine then returns to ignition switch then back again .? Does the ram only work when ignition is on ? The engine doesn’t turn over either so wondering whether there might be a trip or fuse somewhere ? Any input would be appreciated. Did go out on sea trial and all good !, Thanks Mark

 

[spannerman]

Yes power goes to engine first and trim will work without ignition. I would check the battery cables from the battery and up to where they connect to the engine and work onward from there.

 

[304]

Ok thanks for that , would you know what is the colour and position of the supplying wire on harness plug in engine ? also if I put a separate feed on ignition would that then power it all up ?

 

[Grubble]

Have you searched for a wiring diagram for your engine? It will make it a lot easier to fault find if you know what you are looking at.

 

[304]

Thanks for that , not sure where to search ?

 

[frothblower]

Have you checked what voltage you have at the battery now? Could be a dud battery thats not holding its charge.

 

[Grubble]

Thanks for that , not sure where to search ?

Wiring Diagram Mercury 75hp 2006

 

[VicS]

Hi all . I’ve recently purchased a boat with the above engine on .The broker didn’t really go through the process of starting procedure,my fault as thought it would be straight forward . Before purchase the engine did have a problem with the tilt / hydraulic ram but this turned out to be a wiring connection problem apparently. The battery needed a good charge which now has been done and I tried out ram and all good .Turned on ignition and all instrument lights came on with gauges all working. Yesterday I wanted to move boat out of garage and no ignition cluster lights came on and ram not working ? There is 12v power to starter motor and also to aux equipment like radio and bilge etc . Not sure what to do next I assume power goes to engine then returns to ignition switch then back again .? Does the ram only work when ignition is on ? The engine doesn’t turn over either so wondering whether there might be a trip or fuse somewhere ? Any input would be appreciated. Did go out on sea trial and all good !, Thanks Mark

The wiring diagram here may help you but may only apply to much older engines

https://maxrules.com/oldmercs/Wiring/1966ona/75_4cyl.jpg

.

 

[304]

That’s something I can go on now thank you much appreciated for putting yourself out

 

[304]

Have you checked what voltage you have at the battery now? Could be a dud battery thats not holding its charge.

The battery is fully charged but I will put a different one on just to confirm ,thanks for your advice.