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Garmin GMC 507 Autopilot problem

Jpm757

Jpm757

Well Known Member
Just completing a new Garmin upgrade to a friends -8. I am using a Stein Air harness wired to the GMC507 A/P with GSA28 pitch and roll servos and Ray Allen pitch and roll trim servos. My problem is that the pitch and roll modes are reversed, meaning that any pitch command on the A/P causes a roll input, and any roll command is causing a pitch input. I have quadruple checked the wiring and it appears to be correct. Pulling my hair out with this one!
 
I have a 305 but assume it is similar.

My wiring diagram has the roll servo wired to the RS232 #2 on the GMC305.

The pitch is identified by the jumper on pins 5/8 on the pitch servo.

Perhaps one of those is backwards meaning your RS232 is going to your pitch vs roll servo?

There is no RS232 connection only CAN bus to the pitch servo.

Hope that helps.

E
 
The 507 only connects through the can bus so no rs-232. But I bet the pitch jumper is on the roll connector instead of the pitch connector. Look for a wire connecting pins 5 & 8.
 
GMC 507

Jpm757 said:
Just completing a new Garmin upgrade to a friends -8. I am using a Stein Air harness wired to the GMC507 A/P with GSA28 pitch and roll servos and Ray Allen pitch and roll trim servos. My problem is that the pitch and roll modes are reversed, meaning that any pitch command on the A/P causes a roll input, and any roll command is causing a pitch input. I have quadruple checked the wiring and it appears to be correct. Pulling my hair out with this one!
Click to expand...

Good Morning,

Please feel free to send a Flight datalog over to us at [email protected], we would be happy to take a look at it for you.

To identify the servo's from one another, we use the ID pins on J281. For the roll servo, there should be no connection made, for the pitch servo, pin 5 should be connected to pin 8.

If nothing turns up there, please send a picture of your System Information screen to us via email.

Thanks,

Justin
 
ColoradoSolar said:
The 507 only connects through the can bus so no rs-232. But I bet the pitch jumper is on the roll connector instead of the pitch connector. Look for a wire connecting pins 5 & 8.
Click to expand...

Thank You Eric and Justin, you were CORRECT. The jumper was incorrectly placed on the roll connector by Stein Air. Rewired correctly, problem solved!
Thanks again and thank you DR for this forum.
 
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