Lowrance 3500 depth gauge12/22/2023 ![]() Unfortunately, none of the manufacturers are still using the 192 kHz frequency so the existing transducer can't be used. The depth will not read without water, so I didn’t realize that I had some wires backwards until I was on the lake. I would recommend that you build the pigtail out of the boat so that you can put the transducer in a bucket of water for testing. Even though the temp is not correct, I think you need to hook it up because the 3800 is looking for the temp circuit. Then you can use the pigtail to connect the 3800 to the B619 to make a functioning system. My pin-out sketch is attached, no guarantees on quality. From there, use the Airmar cable splice fitting to wire the garmin 8-pin end to the Lowrance uniplug end by connecting the Bare wire to Bare wire, White to Yellow, Blue to Blue, and Black to Black. Next, cut the garmin adapter plug in half. Make sure to leave the smaller wire intact as that is the power and ground (see manual). To make the pigtail, cut the thicker Lowrance transducer wire approximately 8” from the uniplug connector. The wire colors below may not be correct if you connect the 3800 and B619 directly. I made a pigtail out of the transom mount transducer that came with the 3800 and the garmin adapter wire so that I could sell the 3800 and B619 if my experiment did not work. I did not cut the connectors off of the B619 transducer nor the LST-3800. ** Airmar Inline Cable Splice 6 Conductor IP67 Waterproof ** Garmin 6-Pin Female to 8-Pin Male Adapter- Garmin P/N 010-11612-00 ** Lowrance LST-3800 with WSU-HST 200 kHz Transom Mount Transducer I decided to get the bronze version of the transducer rather than plastic because I trailer my boat, you can save a few bucks with the plastic P19 version. This arrangement does NOT give an accurate water temperature reading because Lowrance uses 5,000K thermistors while Garmin (and the rest of the industry) uses 10,000K thermistors. I ended up making a pigtail to mate a Garmin (Airmar) P19/B619 transducer to a Lowrance 3800 gauge. I found out that most of the transducers are made by a company called Airmar, and found out that the depth signals would generally work between manufacturers so long as they were all 200kHz. My Sundeck 220 has a 2” thru-hull fitting at a 20-degree deadrise, and neither of the 2 1/8” gauges Lowrance (LST-3800), Hawkeye (D10D), nor Humminbird (HDR 650) had an off the shelf replacement. My Lowrance 3500 display went bad, and I could not find a used gauge or a new one that would work with the old 192kHz thru-hull transducer.
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