I have a Raymarine RL70 radar/Chart Plotter that was working when it was pulled out (New system was installed) and given to me. When i apply 12VDC to the RL70 head i do net get any response from the head. The screen doesnt light, like there is no power connected. i verified i had 12VDC at the connector , which was directly connected to the battery. ANY ideas on what i should try??

If you are having trouble loading charts on your Raymarine E80 chartplotter, there are several things you can try to troubleshoot the issue:
1. Check the chart card: Make sure that the chart card is inserted correctly and that it is compatible with your chartplotter. Some chartplotters require specific types of chart cards, so check the user manual or contact the manufacturer to ensure compatibility.
2. Check for software updates: Make sure that your chartplotter has the latest software updates installed. You can check for updates on the Raymarine website or by contacting customer support.
3. Check the chart source: Make sure that the chart source is set correctly on your chartplotter. If you have multiple chart sources (e.g. internal memory, external card), make sure that the correct source is selected.
4. Check the chart format: Make sure that the chart format is compatible with your chartplotter. Some chartplotters only support certain chart formats, so check the user manual or contact the manufacturer for compatibility information.
5. Check for obstructions: Make sure that there are no obstructions blocking the GPS antenna or interfering with the chartplotter's reception. Obstructions can include tall buildings, trees, and other objects that block the line of sight to the GPS satellites.
6. Reset the chartplotter: Try resetting the chartplotter to its default settings. This can sometimes clear up software glitches or other issues that may be preventing the charts from loading.
If none of these solutions work, you may need to contact Raymarine customer support for further assistance or repair.

Take care and have a great day! -Alex

either the cord to the chart plotter is faulty or the chart plotter itself is dead short
have an electrician do an insulation test and circuit test on the cord and plotter unit

Check to see if this is a power issue by connecting to shore power and fully charging your batteries overnight with instruments off. While still connected to shore power, with batteries fully charged, turn on C80 navigation system. If the loading screen comes on and does not reset, then try holding down the button immediately to the right of the red power button for at least 3 seconds to see if the system re-boots.

The two devices can share Nav data only. No radar, Sonar or Chart will be shared.
Hook the RL70 and the E80 together on SeaTalk and all data will be shared both ways. Alternatively, it could be done with NMEA 0183, which is directional, or you could also translate the RL70 data to NMEA 2000 and share it that way. As long as you have all Raymarine equipment, you are home free using a three wire Seatalk connection, with only two hooked up, Yellow and Bare, color to color.
Remember, this will share Nav Data only.

1. you must have the latest software 4.29 the new scanner dont work with the old Software.
2. Be shure that you have really put in the connector of the cable inside the plotter its not so easy.
3.
try the plotter on an nother boat with an working system than you will know if its a problem with the antena or Plotter

If both plotter works but they have no comunikation
RESET the RL 70 AND L760
This is how it works
press the powerbutton when you have picture press the menu bottom
than systemsetup and than four seconds the menu bottom.
Do this on both plotter normaly after this it works again

fish finder transducer needs to be on before you boot your system. check your hsb cables and termination

I've had the same problem. before replacing the antenna, try to reset the antenna by removing power to the Raystar 120. Disconnect power by either turning off all batteries or disconnecting the red wire from the antenna at the point where it enters the junction box for the chartplotter. This action effectively removes all memory from the antenna and resets it to factory settings. There is a lithianium battery in GPS antenna that holds memory data in the antenna. Disconnecting the power to the antenna for a few seconds clears the memory.

This is exactly what I did and when I turned the chartplotter back on, my Raystar 120 immediately began working again.

I have one of these same units brand new for sale real cheap

I did exactly what you wish to do a couple of years ago. It was a 5 minute job, cut out the same except the new unit needs a little more space behind and it was a plug for plug swap. Works great and swaps data between the matching chart plotter to give chart overlay on the radar
Richard