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Autopilot Garmin- HELP!!!!

Old 05-05-2018, 10:17 AM
  #1  
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Default Autopilot Garmin- HELP!!!!

Hello
Have Garmin GHC-10 A/P it worked flawlessly for 2 years, now it drifts left and right will not hold heading

I redid dock side wizard and seatrail wizard a dozen times, no luck

Checked for any metal near compass, bleed system, nothing.....very frustrated !!!!!!!!!!!!!!!!!!!
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Old 05-05-2018, 11:48 AM
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Double check for magnetic interference.
i'd pull any and all spare parts and gadgets stored in the hull within a min 1.5m of the heading sensor.
i moved some tools and parts around and found similar issues and had to pull the tools and parts farther away from sensor to remedy issue. When in doubt, remove as far as possible and retest.

also could be pump issue. Garmin pumps are NOT maintenance free. The brushes need to be cleaned periodically (i'd say every other year). As pump slow or intermittent to respond, can lead to pilot wandering and not keeping heading. Via Garmin, not terribly confident in their reman'd pumps which were sent as warranty replacement; on my third pump
this last pump i pulled and serviced the brushes after less than a season from receiving fr Garmin.
I bought the GHP10 for what I thought as great in features, robustness and safety but after 4+ years with the pilot, not overly impressed with the pump(s) {2.1L -01 series}, ability to keep circle pattern, inability to dim display for night mode and PITA steps to switch RPM sensor settings for twin engine to alternately switch motors trolling with out setting off alarms.

if you get to that point, i may be closer now, i'd switch the pilot to a Furuno (should have gone with them first!)
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Old 05-05-2018, 08:51 PM
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Good advice, check the pump. Which heading sensor do you have?
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Old 05-05-2018, 09:30 PM
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If you guys only knew how many Garmin units I've replaced with Ray's Evolution AP's....4 last year and one already this year.

My bet is interference. 9 times outta ten you will get a pump stall or ECU warning failure....Find the ball then really look for any metal a magnet would stick to. If you cannot find anything, I'd expect an ECU or Pump. Either way, for twice the price of a used pump, you can switch to a different brand AP, that is near flawless.

Sorry for your situation...seen this many times.
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Old 05-06-2018, 04:11 AM
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Originally Posted by CME View Post
If you guys only knew how many Garmin units I've replaced with Ray's Evolution AP's....4 last year and one already this year.

My bet is interference. 9 times outta ten you will get a pump stall or ECU warning failure....Find the ball then really look for any metal a magnet would stick to. If you cannot find anything, I'd expect an ECU or Pump. Either way, for twice the price of a used pump, you can switch to a different brand AP, that is near flawless.

Sorry for your situation...seen this many times.
Were the units changed out of owner frustration or component failure? A good replacement heading sensor fixes a lot of woes on the GHC 10 system.


Last edited by kmoose; 05-06-2018 at 04:21 AM.
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Old 05-06-2018, 05:54 AM
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Originally Posted by kmoose View Post
Were the units changed out of owner frustration or component failure? A good replacement heading sensor fixes a lot of woes on the GHC 10 system.


That's an excellent question. Mostly Pump and ECU failures. Funny, have yet to find a bad heading sensor. Frustration can be from many issues. The internet has shown that the pumps are not so awesome...except the SmartPump.

Garmin makes an excellent AP with outstanding interface....Funny how there has been 3 iterations of the TR1 Gladiator replacement......just got to get a very good install and use the SmartPump.

I have said this a 1000x's, the only way I'd own this system is with the Smartpump. But that is a $2000 option!!! When the normal pumps fail, (too much current draw) they either kill the ECU or take out the pump. BUT, the ECU will not last forever after a pump failure--too much stress on it by then. Its is vicious circle! One of the units I replaced the ECU was mounted flat and the weight of the wires going up (unsupported) pulled after a couple of years allowing for an ovaling of the connection integrity, allowing water intrusion. Funny, the wires went up about 8" straight up....that's all it took.

It's not the TR1 Gladiator it used to be. Man, THAT unit was bullet-proof. Many are still going strong around here.

Most of the reason these guys switched was the price for the Ray system, the simplicity of using a knob, fishing patters, automatically calibrates and the pumps can last man many years. It is a damn reliable AP.
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Old 05-06-2018, 09:15 AM
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The OP is a bit unclear to me on if the heading on the autopilot is drifting, or if it is unable to hold the heading. If the issue is that the hearing on the display is inconsistent or drifting, I agree that it is a magnetic issue. I fought this for a long time and solved it with the upgraded garmin autopilot. If the issue is that it is over correcting, I suggest going in and adjusting the parameters manually. You can do things like adjust the slow speed or high speed parameters to either dampen it down or make it more aggressive if needed.
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Old 05-06-2018, 09:31 AM
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jrogers....The problem is that Garmin has its own learning procedure and if it fails, then its his pump or ecu or air.

The real question is, has he gotten an acceptable heading and North set? After that being done and the underway routine failure..., then its off to bleed or buy parts!

Man, I feel for this guy. I do it for a living and don't look forward to this scenario. NOT being able to test specific equipment without known good parts makes this a real PITA to diagnose. The fact that there are no open wired access to componants is my gripe.

THEN, wait till he sees how he gets parts....!!
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