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Old 02-13-2003, 17:32   #1 (permalink)
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Surpressor on EL Fairmont

Does anyone know if and where there is a supressor on the EL (eg on the Dizzy or back of the altenator)??? This morning I started getting engine noise through my Stereo and am hoping this is the problem and not a bad earth.
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Old 02-13-2003, 21:51   #2 (permalink)
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Yes there is a surpressor mounted lower than the dizzy i think
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Old 02-14-2003, 00:30   #3 (permalink)
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Check that your battery has sufficient electrolyte(water) to cover the plates, and that your battery terminals are clean and tight.

Checking all the earth connections too would be a cheap start.

If your still getting a whirring sound it may be that your alternator has lost a phase. Alternators are 3 phase AC generators which have 3 sets of back to back rectifiers to give you the DC. One of those diodes could be crook. The alternator would still charge the battery but give you that whirring from the Alternating Current. To test take the fan belt off and briefly run the engine, if the noise goes away its the alternator. Don't disconnect the wiring of the alternator and run the engine as the alternator will be damaged.

If the noise is still there check the suppressing condensor on the coil.
The suppressing condensor(capacitor) is attatched to the coil bracket and has a wire to the positive terminal of the coil. the wire may have come adrift.

Another thought is that the antenna isn't grounding properly onto the guard. Just needs to be disassembled cleaned up and reassembled.

hope this helps.
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Old 02-16-2003, 15:54   #4 (permalink)
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plarsson- Thanks alot for that mate, I have checked the battery and the earth for the antenna and all were OK, I have also checked common earthing points and all are ok, I will check the alternator though sounds like it might be the problem or the condensor.

I spoke to a few people 2 of which were Mechanics and the general consensus is that they don't have surpressors. Does this sound right??

Thanks again
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Old 02-17-2003, 01:58   #5 (permalink)
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On Electronic ignition vehicles there usually isn't a condenser as such like there is with points type ignitions on the negative side of the coil.

However a Suppressor Capacitor (Or condensor) can be fitted to the positive side of the coil to help reduce the voltage spikes creeping back into the vehicles electrics.

Alternators too have Suppressors fitted to minimise the hash caused by the brushes not seating smoothly on the sliprings.
The Suppressor fly lead is connected to the positive output of the alternator and the body of the Suppressor is bolted to the alternator case (Earth)

Once upon a long bl**dy time ago people were making up names for newly invented stuff. Unfortunately there was'nt the quick communication available then as now. Hence The same things got different names and Condensor (in electronic speak) is also Capacitor.
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Old 02-17-2003, 02:03   #6 (permalink)
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Just had a thoughty,,

Check your speaker connections at the speakers. Especialy the rear ones. You might find one of the connections on the speakers is coming in contact with the chassis. the radio outputs are balanced and when you ground one side it causes the radio to sound like it has interference which goes away when you stop the motor.

Had it happen to me in a cab I drove once, should have thought of it sooner.
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Old 02-17-2003, 15:18   #7 (permalink)
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Plarsson - I have a Pioneer head unit, JL 6"X9" in the rear hooked up to a Pioneer Amp, I have checked the speakers and there is definately no short, if it does short aginst the body it shorts the speaker hence no sound out of that speaker. The sound is there wether it is on radio or CD, it doesn't seem to be relavant to the amps as no matter the volume the noise satys the same volume (eg very dim, can only hear it when Volume is set to 0/ CD is paused). It is definatley engine noise, ie you hear electronic noise as the engine revs and the brake switch cause a staticy click in the speakers.

Also I forgot to mention I have an intermittant problem (happened twice now) where I have started the car at night and then turned the headlights on and the Parkers/dashlights fuse will blow, then as soon as I use the indicators they will blink sowly/dimmly for 3 clicks and then the indicators fuse will blow.
Don't know iof this has anything to do with it or they are isolated problems.
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Old 02-17-2003, 15:42   #8 (permalink)
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Ahh Ok, the fault I had in the cab was with the standard issue radio cassette player.

The fuse blowing, Indicators thing is not related to your noise problem. Do you have a towbar? Id be checking the trailer socket connections and the connections into the wiring loom.
Trailer sockets full of moist mud and corrosion will do weird sh*t with indicators and tail lights. Wonky scotchlocked or Luigi's cousin's Guido's handywork connections into the loom can also be suspect. You might also check the factory trailer accessory socket in the loom (in the boot on the right hand side) to make sure it isn't subject to getting wet.

Try just having the amps powered up and the head unit disconnected.If you still have the noise your amps are picking it up through the power line.

In all this the Basics of fault finding apply. Eliminate one by one any and all possibilities. do it step by step. you will beat this.

By the way what had you (or anyone else) done to the car before the noise started?
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Old 02-17-2003, 15:57   #9 (permalink)
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I had a towbar put in early this year, I had a quick sheck of it and there is definateey no moisture and all connections seemed ok, and the socket is on a lead ie. retracts back into the boot when not in use, but maybe I will have to pull it all open and double check it.

I was afraid of that, i guess I am being a bit lazy in that I didn't want to have to trace it, I thought/hoped that it would be a surpressor or something of sorts that I could just remove and replace and viola problem solved. But I should have known it wouldn't be that easy.

Do you know wether the trigger lines for amps (ie to turn them on) are activated by 12V up the line or is it a open/short comobo?? because with the Stereo disconnected I will need to activate the amps myself.

By the way thanks very much for your help.
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Old 02-17-2003, 16:18   #10 (permalink)
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You'll have to check with the manual or info sheet you got with the Head/amp. If you have a multimeter you could measure it (the control line) and see what the radio head puts out.

I'm not all that knowledgeble about the current lot of incar sound systems. Except that untill they change the laws of physics, they gotta work pretty much as anything else.
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