Hoping someone can give me a trouble shooting tip(s) that I may not have thought of...so far can not figure this out...
So last year bought a new Hummingbird Helix 5 Sonar/GPS. Paid to have professionally installed. The shop did a perfect job. Unlike the 2 previous fish finders I had on the boat that would always cut out (lose bottom) once I got on plane, this one always had a lock on bottom even at wide open throttle. The only exception would be flying over shallow water (2 -3 feet) at wide open it would lose bottom for a second or two but get it right back once in deeper water. We boated quite a bit in the Fraser, Harrison, and assorted lakes last year and never had any issues reading depth at all speeds.
Then last fall the GPS stopped working. I contacted Hummingbird and they said to bring it to the authorised repair center in Abbotsford. I brought it in after boating season was over and the boat was shut down. The shop said they ran a diagnostic on it and replaced the part that was broken. Unfortunately, before I was able to test it out this year both the manufacturer warranty (1 year) and warranty by the repair center (3 months I think) have expired.
So this year I've had the boat out a few times. The fish finder is doing something bizarre and I can't figure out why. So I put the boat in the water and turn on the FF. It fires up no problem and gets a lock on bottom right away. Once I putt putt from shore a bit and let the engine warm up then I get up on plane, hold at wide open for a bit, then back off to cursing speed/RPM.
Initially the FF appears to be working fine. Say we are in roughly 50 feet of water the depth reading will rapidly flicker 50ft, 51ft, 49ft, 48ft, 50ft etc. Even if I keep it wide open (30mph +/-). Even in Harrison Lake it would not lose bottom at cruising speed in 200+ feet of water.
However, now when cruising it will suddenly lose bottom and read "1ft" or close to 1ft. A few times I did not slow down and a few seconds later it sorted its self out and regained a lock on bottom. But other times it would stay stuck on 1ft and would only acquire the proper depth when I let right off the gas. And when were out the other day a couple times it STILL stayed stuck on 1 foot even after I turned the motor off. The only thing that would work if this happened is powering it off/on.
I contacted the repair center and more or less said my FF was working fine before the GPS repair, now is it doing this. Is there any chance something went wrong when you fixed the GPS? The shop wrote back and said "sounds like the transducer, but bring the power head in and I'll run a free diagnostic on it." I plan to drop it off sometime this coming week.
If I get it back and they say it is fine, so it must be something else, not really sure what I'll do. The transducer does not appear to have been bumped/moved or damaged in any way. And if the angle had been moved a bit it should still have no problem locking on bottom - especially with the engine off floating in the middle of the lake (!)
The transducer cable is hidden between the stern and bow and would be a nightmare to uninstall it and try a new one. Plus I'd have to buy the transducer which is probably $200 +/-. I would consider this my last resort.
The only thing I have noticed which I doubt is an issue is the battery seems to be running at a higher voltage than normal. Is this even possible? I'm just going off the dash gauge. The battery is 5 years old but I have not replaced it yet as it still starts the boat fine and I carry a booster pack on board JIC. I'm thinking of taking the battery out and getting it tested just in case it is screwy.
If it were an older GPS I'd just buy a new one and accept it as the cost of owning a boat. However this one is just over a year old and it was not cheap