RD418D

[cherod]

hi ,,, am fitting / wiring in the above , but cant figure , one connection is simple plug in , the other would seem just as simple being three wires , red , black and green ,, i am assuming the red if from the battery possitive , the black from the battery negative but where does the green go ??????????? anyone ?

 

[prv]

Had a look at the manual?

https://productimageserver.com/literature/ownersManual/37438OM.pdf

The green is supposed to go to an “RF ground” - which I’m sure very few yachts actually have. It looks like the best alternative is just to connect it to DC negative.

EDIT: That manual is for the RD418HD - but it matches your description of a green ground wire. Below is the manual for the RD418D, which apparently uses a bare wire for ground:

https://images.carid.com/raymarine/items/pdf/e92132-owners-manual.pdf

Not sure which one you actually have, but I’m sure the grounding principles are exactly the same and the second manual is explicit about connecting it to DC negative if you don’t have an RF ground.

Pete

 

[cherod]

i bought it s / h and no manual ,,, yes i have no " ground " and thot that the only alternative is the common earth .. will have a look throo your links,, ty R , DC negative i presume you mean the negative ( - ) terminal on the battery ?

 

[prv]

i bought it s / h and no manual

Funnily enough I don’t have the paper manual for a radar I’ve never owned either. There are still multiple copies of it in the first page of Google results.

Pete

 

[cherod]

Funnily enough I don’t have the paper manual for a radar I’ve never owned either. There are still multiple copies of it in the first page of Google results.

Pete

i looked at them ,, could not make head nor tail of them

 

[cherod]

Had a look at the manual?

https://productimageserver.com/literature/ownersManual/37438OM.pdf

The green is supposed to go to an “RF ground” - which I’m sure very few yachts actually have. It looks like the best alternative is just to connect it to DC negative.

EDIT: That manual is for the RD418HD - but it matches your description of a green ground wire. Below is the manual for the RD418D, which apparently uses a bare wire for ground:

https://images.carid.com/raymarine/items/pdf/e92132-owners-manual.pdf

Not sure which one you actually have, but I’m sure the grounding principles are exactly the same and the second manual is explicit about connecting it to DC negative if you don’t have an RF ground.

Pete

accordingly i can just join the black and green together ?

 

[Bilgediver]

hi ,,, am fitting / wiring in the above , but cant figure , one connection is simple plug in , the other would seem just as simple being three wires , red , black and green ,, i am assuming the red if from the battery possitive , the black from the battery negative but where does the green go ??????????? anyone ?

If it were on my boat then a good RF ground is a keel bolt. Best to keep it away from DC -

 

[cherod]

If it were on my boat then a good RF ground is a keel bolt. Best to keep it away from DC -

i dont have keel bolts . engine / prop shaft ????

 

[PaulRainbow]

If it were on my boat then a good RF ground is a keel bolt. Best to keep it away from DC -

Even though it's the manufacturers preferred method of connection ?

 

[PaulRainbow]

accordingly i can just join the black and green together ?

The point of grounding is to connect the ground wire to the water. If the engine is connected to the water by an anode, or electrical continuity via the gearbox/prop you could connect to there. If the battery negative is connected to a grounding point (most commonly the engine block/anode) then you can connect to the battery negative. According to Raymarine instructions, the wire should go straight to the grounding point, in reality, every single one of these i've ever removed has had the two wires connected together.

 

[cherod]

The point of grounding is to connect the ground wire to the water. If the engine is connected to the water by an anode, or electrical continuity via the gearbox/prop you could connect to there. If the battery negative is connected to a grounding point (most commonly the engine block/anode) then you can connect to the battery negative. According to Raymarine instructions, the wire should go straight to the grounding point, in reality, every single one of these i've ever removed has had the two wires connected together.

thank you ,,, ( sorry for late reply , i have " been away " ) ,, all units now mounted so will be doing the wiring soon , i may be back for further info ?. ty R

 

[cherod]

The point of grounding is to connect the ground wire to the water. If the engine is connected to the water by an anode, or electrical continuity via the gearbox/prop you could connect to there. If the battery negative is connected to a grounding point (most commonly the engine block/anode) then you can connect to the battery negative. According to Raymarine instructions, the wire should go straight to the grounding point, in reality, every single one of these i've ever removed has had the two wires connected together.

Paul ( as you seem to be the man in the know ) or any other , today i will be wiring up the MFD and Radome , i notice on the mfd ( oem cables ) that the live ( red ) and neg ( black ) are very thin wire ,,, this concerns my limited electrical mind in that it ( by its small diameter ) may be intended for a reduced 12 v supply ,, does this just get connected to the main 12 v power supply or is there some sort of " reducer " to be used . ( raymarine E140W )
T Y , R

 

[Bilgediver]

hi ,,, am fitting / wiring in the above , but cant figure , one connection is simple plug in , the other would seem just as simple being three wires , red , black and green ,, i am assuming the red if from the battery possitive , the black from the battery negative but where does the green go ??????????? anyone ?

Normally an RF ground is independent from other grounds to reduce interference in the receiver. This is a radar antenna operating at very high frequencies and so it is less important to isolate the RF ground and so the alternate of using DC ground is suggested by the maker as this diagram from Ericson Yachts.


rd418d rf earthing - Google Search

 

[cherod]

Normally an RF ground is independent from other grounds to reduce interference in the receiver. This is a radar antenna operating at very high frequencies and so it is less important to isolate the RF ground and so the alternate of using DC ground is suggested by the maker as this diagram from Ericson Yachts.


rd418d rf earthing - Google Search

thankk you ,, ia m past that part now,, now i need to know about the little red and black on the mfd ( as per prev post )

 

[cherod]

raymarine customer services says yes , just connect straight to battery ,,,,,,,,,, anybody ??

 

[PaulRainbow]

raymarine customer services says yes , just connect straight to battery ,,,,,,,,,, anybody ??

Correct. The diameter of the wires is not great, because it doesn't draw a lot of current, rather than it not needing any lesser voltage. Connect to the switch panel, busbar, etc, but make sure you fuse it.

 

[cherod]

yes ,, all good Paul,, thank you ,,fused

 

[cherod]

Paul ,, am i right in a 15 amp fuse for the radome ( 418 D ) located near the battery ?? ty R

 

[PaulRainbow]

Paul ,, am i right in a 15 amp fuse for the radome ( 418 D ) located near the battery ?? ty R

15A is correct, located close to the supply, which is might be the battery, more likely to be a switch ?

 

[cherod]

thanks Paul ,, put it ( 15 amp ) in the dash board beside the bus bar .. turn everything on later today today !!