new starter has only three connecting posts

[melvind1]

I have a 1985 mercruiser 4cyl 120. Replaced starter but the one the auto store gave me only has three contacts rather than the 4 on the one taken off. Wired the two smaller wires that previously were connected to separate posts on the starter, to the same post on the new starter. The motor now starts but won't stay running...any help or do I just need to take the starter back and get one with four contacts? Silly question I know,but I wasn't sure if all new starters only have three connectors. Thanks,DM[

 

[achris]

Re: new starter has only three connecting posts

You need to make sure you have a proper and certified MARINE starter (and yes, there are significant differences between them). The connectors on the new starter are for engines with electronic ignition that don't need a 'resistor bypass' ('I' terminal) on the starter. The other terminal is the 'S' terminal, and that's the one that pulls the starter solenoid in and gets the starter spinning.

Chris.......... And welcome to iBoats.....

 

[84EdH]

Re: new starter has only three connecting posts

Just to emphasize what Chris said: "proper and certified marine starter" is not just a suggestion. It is a major safety issue as boats can hold gasoline fumes and marine starters are designed to produce no spark. You must buy a marine starter......

 

[melvind1]

Re: new starter has only three connecting posts

Thanks...pulled the auto zone starter and installed a new one from mercruiser store. Had no idea about the spark thing.

 

[achris]

Re: new starter has only three connecting posts

Thanks...pulled the auto zone starter and installed a new one from mercruiser store. Had no idea about the spark thing.

Have a troll through many of the threads here on iBoats and the subject of Marine vs Auto comes up all the time.

In a nutshell... Marine rated and certified electrical and fuel system components are design to not be an explosive source in a situation of a fuel leak. This involves special venting, screening and in some cases, a different design. Most of these differences are internal and, from the outside, marine parts and auto parts look the same, apart from the price tag. DON'T BE FOOLED INTO THINKING THEY ARE THE SAME... These subtle differences are what keeps you and your family safe....

Chris.......