Can i replace my 330c head unit with the 525c using the same wires antennae etc lowrance

Question edited for clarity.

Make sure you got the correct transducer Your model comes in single frequency and dual frequency. Make sure the connection on the back of the unit is good and you have no corroded or missing pins. Make sure the software is up to date.

Lowrance LMS-525C DF Fish Finder Parts

Product Description: Designed for salt water or downrigger tracking, this dual-frequency sonar/GPS chartplotter
provides additional 50 kHz readings, in addition to a high-res 480 x 480 display on a 5" screen
and many professional features.

* Dual-frequency 50/200 kHz
* Precision 12-parallel channel external GPS+WAAS receiver
* Lowrance radar compatible
* LowranceNET® networking (NMEA 2000® certification pending)
* High-speed ethernet connection links multiple Lowrance display units and modules to
operate independently on shared network data, including sonar
200 khz transducer PDRT-WBL Part #106-89
Shoot-thru-hull mount, 20 degree pod type with remote temperature (200 kHz). (20 ft cable) Dual Frequency Transducer HP-DFBL260 Part #106-82
Thru-hull-mount, dual frequency bronze housing, high-power multiple element (50 kHz 19 degree
& 200 kHz 6 degree).

HST-DFSBL Part #106-77
Transom-mount, dual frequency skimmer with built-in temperature sensor. (25 feet of cable)

https://www.google.com/search?q=lowrance+lms-525c+df+software+update

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Hey Iva,
Here is the manual.. this should help you with any questions you may have..
https://www.lowrance.com/Root/Lowrance-Documents/LMS525CDF-520C_0151-461_120706.pdf

do you have both power and ground wires hooked up?

I'd suggest calling Lowrance.. Those guys are very helpful with step by step support... I just purchased a used boat with a 525c df on it and been troubleshooting some problems with it. Central time zone and best to call right when they open or turn on the phones at 8:15.

This may or may not offer help but on the lowrance site it has very simple step by step instruction to solving this problem. The first step is to make sure your getting power to the new 4000 series. With a 12v tester you can do this. On the gps unit there is 3 different power sources. One is main power, two is sonar and three is power to data. One you have power going to the 4000 then proceed to other options. I hope you didnt pay full price for your 4000. Lowrance has a replacement process and replaced my 2000 for a 4000 for $120 (2 day shipping). Back to your situation... Out the back of the data will the a cord that connects into the bottom of the T, and the a resistor on one side and the 4000 on the other side.

Make sure that you have powered the NMEA 2000 network. The display unit's power cable has a set of red, black, and sheild wires that need to be hooked up to a 12VDC power source. There is a power diagram somewhere in the manual that should show this.

Make sure that you have the NMEA 2000 network connected properly. If it is a newer version LMS-525, it should just be a single 15ft cable that has two female ends, the module plugs into one end, and the other end plugs into the back of the display.
If it came with some T connecters and 120Ohm Terminator caps, then make sure you have that hooked up correctly. There should be a diagram in the manual for that as well but you just connect the two T's together like TT, put the 120Ohm terminators at each end, and run the extensions to the display and GPS module.

There is a decent troubleshooting guide for checking to make sure power is getting to the module at http://primus.lowrance.com/support/resultDisplay.do?gotoLink=92&docType=1000&contextId=426%3A92.273%2C600.639%2C92.113&clusterName=ClusterPublic&lang=english&docset=%2FDocuments%2FTroubleShooting%2FNew+Utility&contentId=42296cce-4f9b-40c8-9dcf-33d5df754009&responseId=135ccbe2cfd4f608%3A1fe88d%3A1225c5cc17c%3A-bac&groupId=4&answerGroup=1&score=986&page=http%3A%2F%2Fprimus.lowrance.com%2Ficr%2FTroubleShooting%2FNew+Utility%2FNU_GPS_ModNR.htm&result=0&excerpt=Module+Not+Responding+The+GPS+module+not+responding+(early+GPS+products+may+also+indicate+coupler+not+responding)+indicates+that+the+unit+and+module+are+no+longer+communicating.&question=gps+module+not+responding&resultType=5000#Goto92

If this doesn't tell you anything, most likely the GPS module is bad.You will need to contact Lowrance support to get it repaired/replaced. You can call them at 800-324-1356 or email them at http://www.lowrance.com/en/Support/Product-Support/Contact/

have a lowrance lms-330c the depth no. keep changing from hi no. to low no. can not stop it,,, will not show true depth,,, can you help?,,,where can i send it to get it fix?

Try a hard reset:

1. Turn the LMS-330 off
2. Press and hold the ZIN, ZOUT, and PWR buttons
3. Release the three buttons once you see the "warning, do not rely..." message appear

If you get that far, the problem is solved. If you get boot failed again, try installing the latest update which can be downloaded from http://www.lowrance.com/en/Downloads/Product-Software-Updates/

If you still get boot failed, you will need to get the LMS-330 repaired/replaced. You can contact Lowrance support at 800-324-1356 or email them by going to http://www.lowrance.com/en/Support/Product-Support/Contact/

A "soft reset" can be accomplished by pressing and hold "Pages" key and press and hold "PWR" key till USA map comes on , then release both. A "hard reset" requires press and hold both "Z in" and "Z out" buttons and press and hold "PWR" button releasing all three when USA map appears.

check the power connections to the antenna