[C320-list] Is the starter motor the culprit?

[Jeff Hare]

Also, one thing to note is that deep cycle batteries and dual purpose deep cycle/starting generally make poor starting batteries for diesels.It you have the option and have ruled out the wiring and connectors, try a car starting battery and see if your results change.  With a new deep cycle group 27, our engine turned over like the battery was low.  With a car battery, it spun fine.Jeff
-------- Original message --------From: "ptormey 4square.net via C320-list" <c320-list at lists.catalina320.com> Date: 3/29/23  8:11 AM  (GMT-05:00) To: C320-List at Catalina320.com, Troy Dunn <troutwarrior at gmail.com> Cc: "ptormey 4square.net" <ptormey at 4square.net>, Bob Hoyt <rehoyt at gmail.com>, c320-list at lists.catalina320.com Subject: Re: [C320-list] Is the starter motor the culprit? A quick check, Just use the negative cable on your car jumper cables to connect just the battery  negative to the motor itself. Then try starting. IF the negative (ground) connection is the problem the engine should start right up.  IF it's doesn't start right up then the issue is likely the positive circuit.  You might also note the voltage on the panel before and after the jumper cable hook up. It'll jump up if the ground is an issue.PatPat Tormeys/v Blues SkiesNewport RI-----Original Message-----From: C320-list <c320-list-bounces at lists.catalina320.com> On Behalf Of Bob Hoyt via C320-listSent: Wednesday, March 29, 2023 7:18 AMTo: Troy Dunn <troutwarrior at gmail.com>Cc: Bob Hoyt <rehoyt at gmail.com>; C320-List at catalina320.com; c320-list at lists.catalina320.comSubject: Re: [C320-list] Is the starter motor the culprit?I appreciate the tip about the engine glow plugs so I plan to replace them BUT the issue is that the engine barely turns over with two six volt golf cart batteries in series or one Group 27 12 volt battery. That suggests decreased power somewhere in the system. Of course, because it is a boat, the cause might be multifactorial. I'll also remove all wires going into the starter and solenoid and clean them well. Thanks for the suggestionsBobOn Tue, Mar 28, 2023 at 7:57 PM Troy Dunn <troutwarrior at gmail.com> wrote:> Good stuff Guy!>> About that tinned marine wire…. IF ONLY.   The wiring harness on the> Yanmar anyhow is all untinned copper.  It seems that the process of > marinizing a tractor engine does not mean replacing the wiring > harnesses with proper marine grade wiring.>> FWIW>> Troy>-- *Robert (Bob) Hoyt MD, FACP, FAMIA, ABPM-CI**Associate Clinical Professor, Department of Internal Medicine**Virginia Commonwealth University**Richmond, VA**CAPT (Ret) USN*InformaticsEducation.org  <http://InformaticsEducation.org>nocodedatascience.netrehoyt at gmail.comCell: 850-384-5235QR Code for CV