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By: Neil Schwanitz
Email: nschwanitz@aol.com

I searched high and low for the pinout to be able to upload my database upgrades into my Garmin 90. Now that I have them I thought I should share them with the rest. With the cost of flying, I like to save money where ever possible, so this was an ideal project to undertake. Some of the connectors were scrounged from my massive supply of extra parts, others purchased. Even if all the connectors were purchased new this should be a project well under $10.

I wired the end of the yoke mount cable with Molex connectors. This way I can detach the RS232 cables, and also change from a lighter plug to a pre-installed source of power. A separate Molex connector was made for each, with the black wire being common between them. If there is a request, I can supply a drawing of my finished installation. Unless you are used to working with computer cables and low wattage soldering irons, ask for some help from someone! Be sure to install the hood on the RS232 connector.

If using a DB9, RS232 connector (Mouse Port) use this pinout; BROWN Pin 2, WHITE Pin 3, BLACK Pin 5.
If using a DB25, RS232 connector (Com 2 Port) use this pinout: WHITE Pin 2, BROWN Pin 3, BLACK Pin 7.
Cigarette lighter plug RED Positive (center pin) BLACK Negative (side contacts) *The cigarette lighter plug I used has the fuse inside if it, so be sure that you use a 1/4 amp fuse!

See also:

There is quite a good number of Tips etc. under the 'Joe Benkert Forum'. If you have other tips that you'd like to see us publish please use the contribute page.

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