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1998 Mercury 50ELPT 4S - Starter?
#2741170
02/18/19 03:00 PM
02/18/19 03:00 PM
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Joined: Oct 2015
Posts: 150 North, AL
wjohnson1983
OP
3 point
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OP
3 point
Joined: Oct 2015
Posts: 150
North, AL
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I've been recently trying to fix my dad's boat, and wanted to poll the aldeer knowledge before diving too deep and forking out big bucks on parts. Basically you turn the key and nothing would happen at all. Maybe 1 time out of 20 the starter would engage if that. Troubleshooting with the multi meter showed input voltage to the solenoid from the battery and voltage from the switch signal to the solenoid. I wasn't getting anything out of the solenoid to the starter though. My dad replaced the solenoid this weekend and the starter engages every time now, but does not have enough power to turn the wheel over enough to crank the motor .... Reading different forums it could be that the starter now needs rebuilt/replaced, there could be other mechanical failures binding the motor, or still an electrical problem not delivering enough current to the starter? Next troubleshooting steps: 1. Remove spark plugs and turn wheel by hand. If it's still hard to turn, then there a mechanical issue binding the motor. How hard/easy should this turn with plugs in/out? 2. Bypass the solenoid with jumper cables and directly send current to the starter to see if it behaves differently. 3. How hard is it to rebuild a starter vs. buying a new one? (Context for skill level: I'm a SW Engineer with some EE classes under my belt back in the day; Worked on vehicles enough to be dangerous Chilton manuals and youtube videos.) Thoughts and help please
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Re: 1998 Mercury 50ELPT 4S - Starter?
[Re: wjohnson1983]
#2741331
02/18/19 06:32 PM
02/18/19 06:32 PM
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Joined: Sep 2007
Posts: 7,561 Hartselle, AL
trlrdrdave
14 point
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14 point
Joined: Sep 2007
Posts: 7,561
Hartselle, AL
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I guess if it was mine I'd put the jumper cables from a good hot battery on for just a second. If starter turns engine you know you have an electrical problem. If it doesn't you will have to decide if its the starter or the engine. You can take the start off and test it. I have to spray a little white lithium grease on the bendex about every six months just for peace of mind.
"In time of war, send me all the Alabamians you can get, but in time of peace, for Lord's sake, send them to somebody else." General Edward H. Plummer
"Blessed are those who, in the face of death, think only about the front sight." Jeff Cooper
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Re: 1998 Mercury 50ELPT 4S - Starter?
[Re: klay]
#2741758
02/19/19 07:14 AM
02/19/19 07:14 AM
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Joined: Jan 2002
Posts: 10,484 Bham
Dallas County
Booner
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Booner
Joined: Jan 2002
Posts: 10,484
Bham
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Check the cables first. A corroded ground cable will act the same way. And not just the ends, I've seen them corrode in the middle before. Mine did that, but it was a bad (corrosion) connection at the back of the battery switch; the connection at the battery itself looked perfect.
not sure what the best way to handle them is but they shouldnt be on tv and gettn married and raisin kids
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Re: 1998 Mercury 50ELPT 4S - Starter?
[Re: wjohnson1983]
#2745749
02/22/19 09:47 PM
02/22/19 09:47 PM
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Joined: Oct 2015
Posts: 150 North, AL
wjohnson1983
OP
3 point
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OP
3 point
Joined: Oct 2015
Posts: 150
North, AL
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So the saga continued today. For those speaking about checking the cables for corrosion. How did you determine there was corrosion in the middle of a cable without remove the insulation? Assuming multimeter on each end to measure resistance. Removed the bendix gear, cleaned, and lubricated with white lithium grease. When the engine is cranked, the bendix gear raises as it should, turns the main fly wheel very shortly (Maybe 2 seconds). Then bendix and flywheel both stop with the bendix staying raised. Once the key is turned off the bendix drops. I can turn the flywheel by hand even with plugs in. With plugs removed there is a cycle of fairly easy spin and then it's hard to turn like the plugs are in. Pictures of starter internals.
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Re: 1998 Mercury 50ELPT 4S - Starter?
[Re: wjohnson1983]
#2745888
02/22/19 11:13 PM
02/22/19 11:13 PM
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Joined: Sep 2007
Posts: 7,561 Hartselle, AL
trlrdrdave
14 point
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14 point
Joined: Sep 2007
Posts: 7,561
Hartselle, AL
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Can't check resistance with a multimeter because one little good piece of wire will show continuity. Won't tell you anything. I'd be watching the voltage on the starter while it is cranking. I don't really see anything that bad with the starter. I'm not sure why the flywheel isn't spinning free with the plugs out. That sounds strange.
"In time of war, send me all the Alabamians you can get, but in time of peace, for Lord's sake, send them to somebody else." General Edward H. Plummer
"Blessed are those who, in the face of death, think only about the front sight." Jeff Cooper
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Re: 1998 Mercury 50ELPT 4S - Starter?
[Re: wjohnson1983]
#2746057
02/23/19 10:53 AM
02/23/19 10:53 AM
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Joined: Sep 2007
Posts: 7,561 Hartselle, AL
trlrdrdave
14 point
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14 point
Joined: Sep 2007
Posts: 7,561
Hartselle, AL
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why do you need a second voltmeter. Just put the leads on the starter and see what the voltage is when it quits. It ought to be whatever your battery voltage is before you try to crank. It may drop to 10.5 while cranking. I'd just want to know if it drops below 8 or 9 or so. Try it while its off and see how it works.
"In time of war, send me all the Alabamians you can get, but in time of peace, for Lord's sake, send them to somebody else." General Edward H. Plummer
"Blessed are those who, in the face of death, think only about the front sight." Jeff Cooper
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Re: 1998 Mercury 50ELPT 4S - Starter?
[Re: wjohnson1983]
#2748497
02/26/19 12:22 PM
02/26/19 12:22 PM
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Joined: Sep 2007
Posts: 7,561 Hartselle, AL
trlrdrdave
14 point
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14 point
Joined: Sep 2007
Posts: 7,561
Hartselle, AL
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I should be 12v. Its just voltage from the ignition switch. If bendix is jumping out I'd think that is ok. Did you test the starter while it is off? If the starter gets in a bind the voltage will drop but all that heat is going somewhere. So don't leave it engaged long. You could run jumper cables to the starter while its off and see what happens. But most of the time when I get into stuff like this when I take it all apart and don't find any thing actually wrong when I put it back together it works fine! Where is the boat actually? I can PM you my number and walk you through it if you need help. Or if close, come help.
"In time of war, send me all the Alabamians you can get, but in time of peace, for Lord's sake, send them to somebody else." General Edward H. Plummer
"Blessed are those who, in the face of death, think only about the front sight." Jeff Cooper
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