I'm having a hard time figuring out how to wire a b175m to a simrad blue 7 pin. Anyone have the schematic? I'm not sure where the xid wire from the transducer goes. Thanks in advance!
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Need help wiring a b175m to Simrad evo2
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bman440440
I am the one who knocks!!!
- Sep 8, 2010
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ShadowX
I Post A Lot But I Can't Edit This
Give credit to Arbor and the folks at the other site:
Watch the wiring for the two ground connections carefully.
- The brown on the B175M is also connected to the XID and is also connected to the outer shield. It should be tied to the pin 7 of the Simrad connector (bare outer shield wire).
- The inner shield wire is for the transducer and shouldn't be coupled to the other shield due to noise. It should be tied to pin 6 of the Simrad connector (bare inner shield wire).
More info:
Watch the wiring for the two ground connections carefully.
- The brown on the B175M is also connected to the XID and is also connected to the outer shield. It should be tied to the pin 7 of the Simrad connector (bare outer shield wire).
- The inner shield wire is for the transducer and shouldn't be coupled to the other shield due to noise. It should be tied to pin 6 of the Simrad connector (bare inner shield wire).
More info:
Last edited:
Upvote
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Give credit to Arbor and the folks at the other site:
Watch the wiring for the two ground connections carefully.
- The brown on the B175M is also connected to the XID and is also connected to the outer shield. It should be tied to the pin 7 of the Simrad connector (bare outer shield wire).
- The inner shield wire is for the transducer and shouldn't be coupled to the other shield due to noise. It should be tied to pin 6 of the Simrad connector (bare inner shield wire).
View attachment 1469468
More info:
Give credit to Arbor and the folks at the other site:
Watch the wiring for the two ground connections carefully.
- The brown on the B175M is also connected to the XID and is also connected to the outer shield. It should be tied to the pin 7 of the Simrad connector (bare outer shield wire).
- The inner shield wire is for the transducer and shouldn't be coupled to the other shield due to noise. It should be tied to pin 6 of the Simrad connector (bare inner shield wire).
View attachment 1469468
More info:
Thanks shadowx, I called airmar a few days ago and was told to wire it like the first pic I'll post. From what you posted it looks like I need to connect the brown and outside bare wire from the transducer together then connect those 2 wires to the bare wire temp-. Does this sound correct? Thanks again!
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ShadowX
I Post A Lot But I Can't Edit This
The diagram you drew is missing the inner shield connection which goes to the pin 6 of the Simrad connector. I would definitely wire it similar to the bottom one, except you need to add the additional shield connection I mentioned above.
Just use the diagram I showed and you will be fine. Some people combine the shields, but it just creates more noise. It may work, but you will pick up more electrical noise. Depending on the fish finder, they may have a separate ground and shield connection going into the unit. Most keep them isolated from each other until its connected to the PCB board.
As for the tying of the brown to the outer shield, the shield has to be terminated on one end of every shielded connection. This is to provide the proper electrical ground shielding around the entire shield. If its not tied to ground properly, it will pick up noise and couple that noise to the wires.
Since the transducer side of the shielding does not appear that its connected to the brown wire electrically, you need to connect it to ground on the connector side. That is why you see the brown and the shield connect to each other and to the outer shield of the Simrad connector that is tied to pin 7 of the connector.
Would the diagram the guy from Airmar work? Most likely, yes, but it will pick up more noise which you don't want. Properly grounding the shields are very important.
The best way is to make electrical connection inside a waterproof box. This will prevent moisture from corroding the connection. If that is not possible, I would splice the wires and solder them together and apply heat shrink over each connection. Then, I would use electrical tape or shrink wrap to keep the two shielded braids from contacting each other. After all the connections are completed and tested, I would shrink an adhesive lined heat shrink to go over the entire splice. Make sure you slide all the heat shrinks over the wires before splicing or soldering them. If you don't have heat shrink with adhesive, you can apply some sealant on the wires, slide the heat shrink over the splices and shrink everything from middle to the outside to push the sealant pushes out.
You can use butt splice terminals too, but make sure they have heat shrink tubing on it. The problem is that some of the wires are small and the heat shrink tubing may not shrink enough over the smaller diameter wires. You still need to protect the shield wires from touching each other with electrical tape. You can wrap the wire splices in electrical tape, but water can still get in and corrode. I know some people don't care, but they are also the ones who have a hard time dealing with electrical gremlins later on.
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