singing GPR
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Joined: Oct 2011
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From: Exton, PA
singing GPR
I assume it means its dying or dead, but the GPR on my new truck has a high pitch hum/buzz when energized.
figuring it probably means its arcing inside, which can't be good for the GPs, i'm just going to disconnect the ground going to it for the rest of the summer and deal with it in sept/October.
any other thoughts/advice?
figuring it probably means its arcing inside, which can't be good for the GPs, i'm just going to disconnect the ground going to it for the rest of the summer and deal with it in sept/October.
any other thoughts/advice?
Post Fiend
Joined: Dec 2010
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From: Orrville, Ohio
Mine does it every time. And the tone changes the longer I leave it on. People have tried to tell me it isn't making a good connection and will fail in no time, but it's been in there for 2 years and has never failed me yet.
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Joined: Oct 2011
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From: Exton, PA
weird. especially since its all DC current flowing through it. if it were AC, I wouldn't think twice about it, but what would be oscillating in a DC coil? i'm going to sound like a dork here, but from my one college electrical engineering course, in addition to the inductor of the solenoid coil, the circuit would have to have a significant capacitive or resistive (or both) element to it to create a resonance. I couldn't think of where the resistance would be, then it hit me - the GPs, themselves! they're only a few ohms, but I bet that could do it. throw in some corroded connections along the way and I bet that's it. just enough oscillation to bounce the magnet off its endstop, probably...
and the changing tone would be from the GPs changing in resistance as they heat up.
mystery solved? ...maybe.
and the changing tone would be from the GPs changing in resistance as they heat up.
mystery solved? ...maybe.
Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
weird. especially since its all DC current flowing through it. if it were AC, I wouldn't think twice about it, but what would be oscillating in a DC coil? i'm going to sound like a dork here, but from my one college electrical engineering course, in addition to the inductor of the solenoid coil, the circuit would have to have a significant capacitive or resistive (or both) element to it to create a resonance. I couldn't think of where the resistance would be, then it hit me - the GPs, themselves! they're only a few ohms, but I bet that could do it. throw in some corroded connections along the way and I bet that's it. just enough oscillation to bounce the magnet off its endstop, probably...
and the changing tone would be from the GPs changing in resistance as they heat up.
mystery solved? ...maybe.
and the changing tone would be from the GPs changing in resistance as they heat up.
mystery solved? ...maybe.
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