RF Filter
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Postmaster
Joined: Mar 2008
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From: Sweet Home, OR
RF Filter
I need an RF filter in my IDI.
The radio frequency interference is pretty bad some times and not as bad others. You can even hear it on CDs sometimes. The DVD player is useless if the engine is running.
What's wrong with this thing? This is the one part of 12V electrical systems I know nothing about. I hate dealing with sound systems.
Is it something else?
If I need a filter what type/brand/style is the best?
Help me stereo guys!
The radio frequency interference is pretty bad some times and not as bad others. You can even hear it on CDs sometimes. The DVD player is useless if the engine is running.
What's wrong with this thing? This is the one part of 12V electrical systems I know nothing about. I hate dealing with sound systems.
Is it something else?
If I need a filter what type/brand/style is the best?
Help me stereo guys!
Elder User
Joined: Jan 2008
Posts: 698
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From: Guymon
It is probably alternator noise. It could have a bad rectifyer (a diode) in it. They make some little filters for them. If you get the right capcitor, you can shunt the ac signal (noise) out of the 12v system to ground, or use a RF filter transformer wired so that it works against itself to cancel the ac noise. Some audio stores ACTUALLY have someone there that would probably know what you need to fix it.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Check the capacitor mounted on the voltage regulator.
I have seen several that were corroded so bad the wire was disconnected.
Radio Shack has a large pass through capacitor that will filter out alternator, wiper and heater motor interferance.
Right now I can't remember the value, but the sales people will know what you need.
Any decent stereo shop should have the same parts.
I have seen several that were corroded so bad the wire was disconnected.
Radio Shack has a large pass through capacitor that will filter out alternator, wiper and heater motor interferance.
Right now I can't remember the value, but the sales people will know what you need.
Any decent stereo shop should have the same parts.
Elder User
Joined: Oct 2006
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Probably alternator. If so, it should follow engine RPM. One other wild guess would be an electric fuel pump, if you've added one.
Since DVD players weren't stock, how is it wired in (both power and ground)?
I bet if you went to the dealer, they'd try to sell you "resistor plug wires"
Since DVD players weren't stock, how is it wired in (both power and ground)?
I bet if you went to the dealer, they'd try to sell you "resistor plug wires"
Posting Guru
Joined: Sep 2007
Posts: 2,207
Likes: 1
From: Las vegas
Alternator is the only thing it could be, unless you MOPAR nuts have found a way to add spark plugs to an IDI
. Your diode trio is probly bad. Take a DMM put it on AC volts and go from positive to negitive if you have more than 1.5v your diodes are bad.
. Your diode trio is probly bad. Take a DMM put it on AC volts and go from positive to negitive if you have more than 1.5v your diodes are bad.
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Postmaster
Joined: Mar 2008
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From: Sweet Home, OR
The electric fuel pump is not wired up yet so that's not it. I'm sure it's the alternator and it does follow the rpms. I'll have to check the diodes, if they're bad I need to change them out anyway.
I needed the info on the filter. Thanks.
I don't know how the DVD's wired up. But it is useless with the motor running right now.
I needed the info on the filter. Thanks.
I don't know how the DVD's wired up. But it is useless with the motor running right now.
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Posting Guru
Joined: Sep 2007
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From: Las vegas
As far as I know you shouldn't need a filter if your alternator is working properly atleast as far as the cd player is concerned no too sure on that DVD player you got in your aperant pimp ride.
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From: Sweet Home, OR
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From: Guymon
Well, at work againg, we have some 6bt (i think they are bt but I know they are cummins diesel engines) cummins with ignition packs and plugs in them that run on CNG that have a maximum rang of less than 100 miles on 2 tanks bigger than me and have no power.
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From: Sweet Home, OR
I've never heard of a Cummins with anything but a grid pre-heater in the intake but they were put in all kinds of equipment so I'm not gonna say they're ALL that way. If it's a 359 C.I.D. Cummins burning that muck fuel with no power it must be pulling the Space Shuttle to it's launch site all by itself! Something sounds fishy, maybe Compressed Natutral Gas is extremely inefficient.
Elder User
Joined: Jan 2008
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From: Guymon
It is inefficient but i guess it burns cleaner. Im sure hardly anyone uses it. We have some older ups trucks that had the converted cummins. Im sure its not a conversion made by cummins though. They mainly use it just for around town deliveries and we have probably 35 cng package delivery trucks and about 6 are cummins. They must not have a conversion for the 7.3 idi or Im sure we would be using them as well. and we have probably 50 or so of them.
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What about the capacitor on the voltage regulator? Did you find it? Is it hooked up? I'd replace it first before bothering with a filter.
I know it's a pain, but make sure your power and ground connections are done right. The unit might be grounded through the antenna lead or to the dashboard, or powered from some place strange...
I know it's a pain, but make sure your power and ground connections are done right. The unit might be grounded through the antenna lead or to the dashboard, or powered from some place strange...