Volvo Penta wiring issue - SailNet Community

   Search Sailnet:

 forums  store  

Quick Menu
Boat Reviews  
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Hatches and Portlights
Interior And Galley
Marine Electronics
Other Items
Plumbing and Pumps
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here

Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
Old 06-08-2009
US27inKS's Avatar
Midwest Puddle Pirate
Join Date: Feb 2005
Location: Gardner, KS
Posts: 2,160
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
US27inKS has a spectacular aura about US27inKS has a spectacular aura about
Volvo Penta wiring issue

Just a little heads up for those who own Volvo Penta diesels. I helped a friend solve a mysterious and terribly intermittent loss of power problem on his 2001 Beneteau. Every time he really needed his engine, it had no power to the instrument panel, and of course wouldn't start. He and a friend could get the engine to fire by supplying both power and ground to the starter solenoid.

When I was finally able to see the problem occur, I found that there was power to the instrument panel through the "instrument lights" switch. This switch powers everything and should be labeled "master". So I knew I had a ground problem. The wiring diagram shows that the instrument panel, both warning switches, the starter relay, and the starter solenoid all ground to the back of the alternator. The alternator diagram shows what appears to be a ground through the case. I pulled the alternator off, expecting to find a corroded ground wire to the back of the alternator. The wire wasn't corroded. Stuffed behind the alternator I found a 12 gauge wire with a boot on it that I hadn't removed. I followed the wire, and found that it attached to the same bolt as the main ground wire from the battery to the engine. Apparently the system had been grounding through the alternator case ever since this wire had been left off, possibly for years, until one day it didn't. The fat ground wire was there to make sure it continued to have good ground.

So if you own a Volvo Penta diesel, don't forget the large ground wire to the back of the alternator. If you do, the gremlins will come visit you months or years later.

Incidentally the Volvo manual that can be found online shows a ground wire from the back of the alternator to an unidentified item, and back to the battery. The Beneteau manual just shows a ground schematic symbol at the alternator.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
John USYacht 27 "Cora Lee"
Reply With Quote Share with Facebook
Old 06-09-2009
Vitesse473's Avatar
Wannabe Sailing Bum
Join Date: Mar 2008
Location: SF Bay Area
Posts: 142
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
Vitesse473 is on a distinguished road
I have an '02 Volvo Penta TMD22p turbo diesel in my Bene. I'll check my connections next time I'm at the boat. Thanks for the heads up.
Reply With Quote Share with Facebook

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Volvo Penta Parts Availablility (or lack there of) in Canada firehoser75 Gear & Maintenance 1 08-27-2013 09:05 PM
Volvo Penta Outboard? rhbroehl Gear & Maintenance 9 07-23-2011 01:40 PM
Volvo Penta diesel mechanics in the Norfolk, VA area? jorgenl Gear & Maintenance 9 01-25-2009 03:19 PM
MD7A Volvo Penta Timing Gear shebobah Gear & Maintenance 5 10-27-2008 03:23 PM
Volvo Penta engine rondezvous Gear & Maintenance 1 09-24-2006 12:24 PM

All times are GMT -4. The time now is 04:07 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) LLC 2000-2012

The store is owned and operated by a company independent of the forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.