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Mercury 75 EFI Doesn't Like to Start

 
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RickFish



Joined: 26 Jul 2016
Posts: 2
City/Region: Seattle Area
State or Province: WA
C-Dory Year: 2007
C-Dory Model: 19 Angler
Vessel Name: Salish-C
PostPosted: Mon Oct 30, 2017 2:21 pm    Post subject: Mercury 75 EFI Doesn't Like to Start Reply with quote

I have a 2007 19' Angler with a Mercury 75 EFI. The motor runs great and only has about 200 hours, but it doesn't want to start consistently. When I try to start it, I will get a "click" from the starter relay. After several tries, it finally turns over and starts immediately. I have 12.5 volts at both the solenoid and starter, so it's not the batteries. Would a bad EFI card cause this? Any ideas on what else to try?

Thanks

Rick

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PaulNBriannaLynn



Joined: 26 Oct 2012
Posts: 757
City/Region: Fort White
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 22 Cruiser
Vessel Name: TBD
Photos: Lorelei
PostPosted: Mon Oct 30, 2017 2:38 pm    Post subject: Reply with quote

I'm not familiar enough with the merc to be able to say what it is exactly, but I had the exact same problem with a 2009 Yamaha 225 on our previous boat.

I searched the internet for the same symptoms you described and discovered it was a relatively common problem. The starter relay starts to work intermittently. For me I would try to start the boat, and just get a click. I would wait and try again, and after a number of tries it would finally turn over and start.

I ordered the part from SIM Yamaha, replaced it myself and it fixed the issue.

I know that Yamaha made some of the powerheads for Mercury around the mid 2000s but I don't know if it was your year. I would look at that starter relay.

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2009 Parker 23 sold 10/2017
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thataway



Joined: 02 Nov 2003
Posts: 20778
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
PostPosted: Mon Oct 30, 2017 3:58 pm    Post subject: Reply with quote

Two most common are: starter relay, as above, and corrosion. 12.5 volts with a fully charged battery which should be 12.7 volts is a drop. When you place a load there is just not enough good conductive surface.

Go thru the whole system pull each connection, clean it with a small wire brush, put in a conductive grease and tighten. That is the cheapest --and needs to be done every year or so.

Is the Bendix gear engaging when you get the "click"? That is pulled up as the first stage before the motor rotates. That needs to be kept clean of salt and materials, plus occasionally a light grease application to the shaft.

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Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
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Home port: Pensacola FL
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RickFish



Joined: 26 Jul 2016
Posts: 2
City/Region: Seattle Area
State or Province: WA
C-Dory Year: 2007
C-Dory Model: 19 Angler
Vessel Name: Salish-C
PostPosted: Thu Jan 25, 2018 5:53 pm    Post subject: Reply with quote

After replacing the solenoid to no avail, the bendix was engaging but not turning the motor over. I bought a replacement starter. It was a different style and an improvement over the original design. Motor started on the first try! Looks like it was a bad starter all along, but now I know a lot more about the entire engine electrical system.
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BrentB



Joined: 15 Jul 2006
Posts: 4419
City/Region: Greenwood
State or Province: IN
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PostPosted: Thu Jan 25, 2018 6:53 pm    Post subject: Reply with quote

I would check the amperage or amps with AC/DC with ammeter
less than $50 from Sears

and
have the batteries load tested

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BrentB



Joined: 15 Jul 2006
Posts: 4419
City/Region: Greenwood
State or Province: IN
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PostPosted: Thu Jan 25, 2018 6:55 pm    Post subject: Reply with quote

I would clean and tighten the battery connections and on OB side terminal block and down stream to the starter just to R/O poor or bad connections
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