Kenwood radio interference issue

[attreui]

I have been trying to trouble shoot this for a while now. I have a kenwood marine media receiver. But my boat mounts it on the passenger side so I got a controller that fits into a guage hole and runs to the receiver via a single wire. I assume it’s the same as a steering wheel system in a car. The controller also takes power. The system works fine and as it should, until I turn the engine. The remote no longer functions at that point. I have installed an automotive noise filter on the power cable for the receiver and the remote and still am having problems. I’ve also made sure they were both grounded back to the main fuse block. I need some more suggestions. Any help would be appreciated.

 

[dingbat]

I have been trying to trouble shoot this for a while now. I have a kenwood marine media receiver. But my boat mounts it on the passenger side so I got a controller that fits into a guage hole and runs to the receiver via a single wire. I assume it’s the same as a steering wheel system in a car. The controller also takes power. The system works fine and as it should, until I turn the engine. The remote no longer functions at that point. I have installed an automotive noise filter on the power cable for the receiver and the remote and still am having problems. I’ve also made sure they were both grounded back to the main fuse block. I need some more suggestions. Any help would be appreciated.

What motor are we talking about?

You say “interference”….how does it manifest?

What happens if you remove the wire running between the two units. Head unit functions normally? No static?

How does starting the motor affect the voltage to the units?

Where are you pulling power from?
Both units grounded to the same location?

But an ohm meter between the two grounds in question. What does it read?

 

[attreui]

What motor are we talking about?

You say “interference”….how does it manifest?

What happens if you remove the wire running between the two units. Head unit functions normally? No static?

How does starting the motor affect the voltage to the units?

Where are you pulling power from?
Both units grounded to the same location?

But an ohm meter between the two grounds in question. What does it read?

Sorry I should have put engine info on there. It’s a Volvo Penta 3.0 stern drive.

It has to be an emf interference because everything works fine and then when the engine is running it just stops working. The radio still works fine but the remote doesn’t.

If I disconnect the control wire nothing happens. Radio still works.

I didn’t check the voltage, I just assumed that it was ok since with the engine running it’s basically pulling off the alternator but I will verify. The guage is showing 14v as normal.

Both the controller and the stereo are coming off the stereo fuse on the main fuse block under the console. Grounds also coming off there.

I didn’t think to check the resistance of the grounds. That’s a great idea. I’ll try that.

Thanks for your reply!

 

[Chris1956]

Your motor uses power from the ign key to produce spark. You might see if that purple wire is close to your remote wire. That is another source of potential interference.

Try turning on the ign and not starting the engine. If the remote doesn't work, it might be for that reason.

 

[attreui]

Your motor uses power from the ign key to produce spark. You might see if that purple wire is close to your remote wire. That is another source of potential interference.

Try turning on the ign and not starting the engine. If the remote doesn't work, it might be for that reason.

I’m sure it is. They all run together. I’ll see if I can seperate it out. Wonder if a shielded cable would work. Kenwood doesn’t specify that out but it has to be a digital signal.

It works fine with the key on. Just not with the engine running.

 

[Chris1956]

There must be some sort of grounded shielding you can encase the signal wire in. I would have thought Kenwood would have thought of that, if their signal is so weak. Your motor is quite far away to interfere, IMO.

What about the tachometer signal? That might interfere as well because is it likely related to the pulses of the ign system. You could disconnect it at the coil and see if that fixes it.