Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 29-12-2012, 16:18   #16
Registered User

Join Date: May 2007
Location: Colorado; Sailing Sea of Cortez
Boat: Tartan 33R
Posts: 174
Re: Raytheon Autopilot Questions


If you have a ST4000 PLUS (large screen), you must have a load (motor) attached to the motor terminals to test the output voltage. If not, you will see a short voltage spike and then it will fall off.

You can remove the motor wires from the head and connect the motor wires directly to 12 volts. That will tell you if the motor is OK.

On the ST4000 plus, "Low Batt" is almost always a problem inside the head and is caused by a variety of problems such as bad transistors / diodes / resistors...

Capn Dan is offline   Reply With Quote
Old 30-12-2012, 09:33   #17
Registered User
flink's Avatar

Join Date: May 2011
Location: Galveston, TX
Boat: Block Island 40
Posts: 90
Re: Raytheon Autopilot Questions

Thanks guys,

I've followed all of the suggestions here. Tested voltage to the powerhead, clutch, etc.
Cleaned all connections, replaced questionable connections, connected the motor directly to 12v source (motor works).
My problem is most likely a prob with the control head based on what I've read here. I'm going to try to find a used one to get me by until I can get a monitor wind vane.
If dulcesuenos's offer is still good it looks like I'm also in the market for some nice cigars.

Thanks for all of the help. At a minimum I now know a lot more about my autopilot.
You guys rock.

Thanks again,


I have found that drinking rum in sufficient quantities will produce all the effects of intoxication....
flink is offline   Reply With Quote
Old 30-12-2012, 10:15   #18
Senior Cruiser
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,134
Re: Raytheon Autopilot Questions

Originally Posted by flink View Post
Now there's a guy who can get sh*t done. That's good stuff. I'm not quite there yet but I'll make note of this guys solution, just-in-case....
Better just to have one of these in the spare parts onboard.

autohelm 4000 belt | eBay

Also, regarding bad connections in the control head, here's what I've done to repair mine.
It would occasionally turn hard to port or starboard for no apparent reason especially after a long time of use, then slowly go back on course if I didn't manually correct it.

The fix was resoldering nine out of a possible twelve bad connections to four power transistors in the head unit.
Each transistor has three leads. The transistors get warm during use and eventually the solder connections crack from stress.
The cracks are very small, but that's all it takes to give problems.
The transistors are all mounted around the middle of the board and are probably black in color.
"I have never understood why it is "greed" to want to keep the money you have earned,
but not greed to want to take somebody else's money"

-Thomas Sowell
senormechanico is online now   Reply With Quote
Old 30-12-2012, 11:32   #19
Registered User
Dulcesuenos's Avatar

Join Date: Dec 2010
Location: Florida Keys, Bahamas Bound
Boat: 38' French Cat
Posts: 2,650
Images: 4
Offer still good, pm me your address info and well get her shipped, wont be till after the second when we get back to land.
Dulcesuenos is online now   Reply With Quote
Old 05-01-2013, 01:07   #20
Registered User

Join Date: Jan 2013
Location: San Francisco Bay
Boat: Olson 34
Posts: 58
Re: Raytheon Autopilot Questions

I have had issues with two ST4000 control heads. They absorb moisture and eventually will fail in various ways. You might try something that has worked for me several times. While on a 400 mile sail I placed the ST4000 control head in a dry plastic bag and let it sit in the sun for 1/2 day to drive the moisture out. Afterwards the unit worked well for a few days. After a few wet foggy evenings at sea it acted up again and again drying brought it back to life.
brianb00 is offline   Reply With Quote
Old 05-01-2013, 19:01   #21
Registered User

Join Date: Jan 2011
Location: Southern West Virginia
Boat: chrysler c-22 pilgrim
Posts: 30
Send a message via Yahoo to Straightrazor41
Re: Raytheon Autopilot Questions

I'm looking for a control head for the st4000 drive unit. I have'nt had any luck finding one but I did run across a flat rate repair service from Raymarine for $250.00 for the st4000 control head if it helps any. also if anyone has one to part with I would be interested in it good or bad.

Straightrazor41 is offline   Reply With Quote

autopilot, raytheon

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 17:13.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.