Electrics suppressor
#1 Electrics suppressor
Hi,
I was taking the rev counter out to try and repair the clock and notice the small grey electrical fitting with a black wire just below the choke cable arm. The cable was not connected to anything. Is it a suppressor for the rev counter or radio and where should it connect to? I couldn’t see it on the wiring diagram but it looks like a factory fitting.
Thanks Pop
I was taking the rev counter out to try and repair the clock and notice the small grey electrical fitting with a black wire just below the choke cable arm. The cable was not connected to anything. Is it a suppressor for the rev counter or radio and where should it connect to? I couldn’t see it on the wiring diagram but it looks like a factory fitting.
Thanks Pop
Pop
E Type Series 1 1/2 OTS [last one off production line] 1968
TVR Chim 1996
Porsche Panamera 4
E Type Series 1 1/2 OTS [last one off production line] 1968
TVR Chim 1996
Porsche Panamera 4
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#2 Re: Electrics suppressor
It's just a capacitor. It is there to iron out any voltage spikes and provide a slow ramp up of voltage when the car starts. One side is connected to the 12v supply and the other side is earthed by connecting to the chassis.
kind regards
Marek
kind regards
Marek
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#3 Re: Electrics suppressor
Hi Marek,
Thanks for the reply. Is there a specific point it should be connected to on the supply. It only has a thin short cable,
Thanks Pop
Thanks for the reply. Is there a specific point it should be connected to on the supply. It only has a thin short cable,
Thanks Pop
Pop
E Type Series 1 1/2 OTS [last one off production line] 1968
TVR Chim 1996
Porsche Panamera 4
E Type Series 1 1/2 OTS [last one off production line] 1968
TVR Chim 1996
Porsche Panamera 4
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#4 Re: Electrics suppressor
It has a thin short cable because it needs to go right next the thing it is protecting.
Given that it wasn't even connected and everything was still working, I wouldn't get too hung up about it. A rev counter working off of a points ignition would be a place where you expect voltage spikes - that's how they work.
kind regards
Marek
Given that it wasn't even connected and everything was still working, I wouldn't get too hung up about it. A rev counter working off of a points ignition would be a place where you expect voltage spikes - that's how they work.
kind regards
Marek
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#5 Re: Electrics suppressor
They were commonly fitted to the low tension side of the ignition circuit, and to the alternator, to suppress radio interference
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#6 Re: Electrics suppressor
Thanks for the info guys. Given its probably not been connected for years and the car starts and runs ok, i think i will ignore it.
Kind regards Pop
Kind regards Pop
Pop
E Type Series 1 1/2 OTS [last one off production line] 1968
TVR Chim 1996
Porsche Panamera 4
E Type Series 1 1/2 OTS [last one off production line] 1968
TVR Chim 1996
Porsche Panamera 4
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#7 Re: Electrics suppressor
and to the voltage regulator behind the central instrument panel which is where yours may well have started life.christopher storey wrote: ↑Fri Feb 12, 2021 11:33 amThey were commonly fitted to the low tension side of the ignition circuit, and to the alternator, to suppress radio interference
They were associated with the fitting of a radio to suppress interference as Christopher says rather than with the build of the car. Given that many/most/nearly all? radios were fitted at the dealership not the factory, there would have been more variability in where they were fitted depending on the skill and diligence of the technician fitting the radio.
You don't need them if you haven't got a radio, the car will run fine with or without them.
John
1969 Series 2 FHC
1969 Series 2 FHC
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#8 Re: Electrics suppressor
That’s helpful information John
Thanks Pop
Thanks Pop
Pop
E Type Series 1 1/2 OTS [last one off production line] 1968
TVR Chim 1996
Porsche Panamera 4
E Type Series 1 1/2 OTS [last one off production line] 1968
TVR Chim 1996
Porsche Panamera 4
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#9 Re: Electrics suppressor
Hi
Its true that your car will run fine without these suppressors and you won't notice if you don't have a radio fitted. Other people might notice though because you may be causing interference to their broadcast signal reception, which is actually illegal.
If you have suppressed HT leads or plug caps then that is usually enough for ignition generated RFI but sometimes your dynamo or alternator can be guilty of RFI and a suppressor needs to be fitted there. Sometimes windscreen wipers also cause interference, as can pretty much any motor driven item.
Regards
Its true that your car will run fine without these suppressors and you won't notice if you don't have a radio fitted. Other people might notice though because you may be causing interference to their broadcast signal reception, which is actually illegal.
If you have suppressed HT leads or plug caps then that is usually enough for ignition generated RFI but sometimes your dynamo or alternator can be guilty of RFI and a suppressor needs to be fitted there. Sometimes windscreen wipers also cause interference, as can pretty much any motor driven item.
Regards
Stuart
If you can't make it work, make it complicated!
'62 FHC - Nearing completion
'69 Daimler 420 Sovereign
'78 Land Rover Series 3 109
If you can't make it work, make it complicated!
'62 FHC - Nearing completion
'69 Daimler 420 Sovereign
'78 Land Rover Series 3 109
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