Maybe you can help me....

[Rich]

Called Lowrance this morning. I explained your issue to the Tech. He suggested swapping the T's for the GPS and the Etec. After doing so, see if the Etec comes up on the bus. If it does the T connector probably needs to be replaced.

If you still have the problem, your best bet is to call Lowrance tech support directly. They said they can walk you thru some more tests. Better Plan on calling first thing in the morning as wait time is looong.. 800-324-1356

I was reading on another Forum that a guy had a similar issue, he could not see the Etec with the key in the on position. He replaced the cable thinking it was bad, and same problem. He dropped it in and while it was running it finally came up. Have you tested it while the engine was running?