Radio interferance problems

just rebuiltt a fj45 1972, completely rewired everything, radio doesn't work properly

  • wireing

    Votes: 3 75.0%

  • radio problems

    Votes: 1 25.0%
  • Total voters
    4

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Coolerman said:
But if the impedance is mismatched wouldn't it sound muddy all the time, not after a period of time?
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The sound after about 10 min isn't muddy its unrecognizable. and starts getting very quiet. If I coast or idle the Ute, perfect sound. revving also has a direct effect on the volume after the 10min period. When you rev it goes really quiet, then back to great sound as soon as I lift the throttle. (And its not industrial deafness from the engine, other agree with me it doesn't work properly)
 
Maybe try a different head unit could have got a bad one
I had a alpine head unit make scratchy sounds and loud popping sounds by loud way over the. Volume the radio was set at Was a flexible printed circuit
Ribbon for lack of a better word
Had rubbed through and would short on the radio housing
It seemed rpm related sounded great parked idling
Rev it up it got crappy and got worse the more you drove it
It was only days old when this started
 
Coolerman said:
Have you checked the output of the alternator/regulator to see if maybe you have an OVER voltage condition at higher RPM?
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My gauge is reading 14.6v last night I took her for a long run in some pretty heavy rain. With the lights on (led headlights) the wipers on full speed, 200watts of Spot light and the fan going the radio was perfect so voltage could be an issue. Although the radio days its good from 10v to 18v. Still haven't had a chance to run from an external supply.
 
Over voltage is the issue! Your radio (or amplifier) can't deal with voltage over 14+ Volts.
Hmmmmm, now, how to fix this?
Adjust the (external) voltage regulator a little bit down to 14.2V
If you have an alternator with internal VR, this doesn't work.
Or, put 1 or more diode(s) in series with the power line. Every diode creates a voltage drop of 0.7 Volt.
or..... let me think about this.

Rudi
 
bj40green said:
Over voltage is the issue! Your radio (or amplifier) can't deal with voltage over 14+ Volts.
Hmmmmm, now, how to fix this?
Adjust the (external) voltage regulator a little bit down to 14.2V
If you have an alternator with internal VR, this doesn't work.
Or, put 1 or more diode(s) in series with the power line. Every diode creates a voltage drop of 0.7 Volt.
or..... let me think about this.

Rudi
Click to expand...
Hey Rudi Thanks I do have a solid state regulator fitted but that I cant adjust. I also have a points style but Iv never worked with them before Ill put up some photos of it if anyone could tell me which way to wire this one. on my alternator Iv only got + and field. The last photo is the solid state, the pink goes to the starter as the sense wire and the orange goes to field on the alternator there is also an earth which you can just see the black wire alongside the orange,it goes from the alternator to the guard and the solid state regulator housing. It would have been good to stick with the solid state but seeing as it is non adjustable Ill have to go with the higher maintenance option.
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Last edited:
Sorry everyone for not replying sooner. The problem is solved. I ended up putting in an Audio suppression filter (consists of a capacitor and magnetic ferrous winding with the power cable wrapped around) which I pulled apart and put in 3, 10amp diodes before hand (it took a few trial runs the fine tune the amount and power of the diodes). the system work perfectly now, and as a bonus the radio work for 30 seconds after I turn the key off.
 
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