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Garmin autopilot zig zag issues after re powering

Old 07-27-2013, 03:46 PM
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Default Garmin autopilot zig zag issues after re powering

My friend and I both re powered 32 ft contenders with new yamaha 300's four strokes with the electronic controls. Both boats have garmin autopilots that were working great with the older 250's. one unit is a tr1 and the other is a more recent garmin unit from 2011. After repower, both autopilots have a constant zig zag at both low and high speeds. So much so that it will make you turn the units off at cruising speed. We have adjusted the sensitivity which as not helped. My dealer is currently speaking to garmin to see what may be causing it. I was wondering if anyone has had this issue and what was done to correct it.
Old 07-27-2013, 09:03 PM
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My guess is the autopilot can't get a the RPMs correctly off the engines.

here is an old thread on this topic.
http://www.thehulltruth.com/marine-e...autopilot.html

pat
Old 07-28-2013, 06:44 AM
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the newer garmin autopilot will be able to work with gps speed and not use the tach speed at all. the tr1 i think has to have the tach. have you gone through a new calibration with the new motors installed? also a dumb question but when doing the new install did they put any power steering pumps or rigging near your compass ball?
Old 07-28-2013, 06:21 PM
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Thanks for the input. The dealer is still working with garmin on the issue...however it seems to be coming down to the rpm issue. No new equipment was placed near the compass ball and the tr1 was completely reset with the new engines. That improved the low speed issue but not the high speed.

I will pass the GPS speed alternative to my buddy and see if he can get garmin to help him with his problem.

Thanks
Old 07-29-2013, 07:42 AM
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How are you getting your tachometer reference signal to the autopilot?

Did you install Command Link Plus instrumentation or do you have conventional multi-function Yam gauges or perhaps the original Command Link instrumentation?

What is the model identity of the "more recent" Garmin unit from 2011?
Old 07-29-2013, 05:31 PM
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The newer autopilot is a GHC 10. The original command link gauges were kept on both boats. On how the dealer is getting the rpm signal to the autopilot I'm Not sure yet but will be at the dealership on Wednesday to find out. Thanks.
Old 07-29-2013, 06:41 PM
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With Command Link gauges, there should be a digital to analog converter box plugged into one of the CL device ports. That converter box outputs a tachometer reference signal for the autopilot.

This assumes that you do not have an NMEA 2000 network plumbed to the motor and to the autopilot, in which case the tachometer reference will be provided via the NMEA 2000 network

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