Starting problems on a 75 mariner

[Scousedeli]

Hi All

We are having problems starting our 75 mariner without jump starting it, once running it will restart time and again?

Is it the battery, starter or other?

Any suggestions would be grately appreciated

Cheers

Lee

[Jizm]

I would borrow a known good battery and see what happens then.

[outboardtech]

Hi , First thing I would do is a Battery LOAD TEST . Ok even though your battery shows 12.3 or around there it dosent mean the battery is GOOD . When the engine is running this is charging the battery with your rectifier / regulator . If your battery has a weak cell this will cause running and starting issue's . If you havent got a LOAD tester just replace the battery . A load tester puts load on the battery the same as the Outboard would when it is running and by doing this the battery voltage should NOT DROP below 10.5 v to 12v approx . I have replaced several battery's even though they are showing 12.5v with ignition key on . Replace battery and then test , if still the same , check your voltage at the starter solenoid , if OK , you may just have a stuck brush in the starter . Most important of ALL CHECK YOU HAVE A GOOD engine earth and that your battery cables are good . A BAD earth and bad battery cables can cause alot of problems especially on starting up a cold outboard . hope this makes sense

[Scousedeli]

Cheers for the tips. I'll try what you have suggested and report back!

Lee