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  #1  
Old 12-27-2019
methrasher methrasher is offline
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Default 12 Volt DC Filter

I have a question about the filter in my 1981 FCSB. All of the wiring diagrams that I have found show it having three 10 gage wires going to it. 1 white, 1 black and a 1 yellow. Mine however has a small circuit board with 12 volt input to it, with outputs controlling a large relay with 2 16 gage outputs orange and red. I have not discovered what it is controlling. Any ideas?
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  #2  
Old 12-27-2019
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gcyeaw gcyeaw is online now
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The original filter was a large box under the couch. It contains some large capacitors and chokes. Possibly someone replaced it with a modern noise filter?? Not sure why the relays, assuming they are where the filter was.

OK, I forgot about the switch in the back of the upper compartment near the bathroom wall. it turned the output (or input) on/off for the filtered DC. Possibly that is what enables the relays?
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Old 12-27-2019
methrasher methrasher is offline
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It is the original DC filter in the white box but has had things added? I don't have a switch in the location you stated. here's a picture.
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Old 12-30-2019
methrasher methrasher is offline
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I guess that there is no easy answer to my dilemma. Iā€™lljust have to disconnect it one wire at a time and try and find what stopsworking.
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Old 12-30-2019
MRPutz MRPutz is offline
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Curious what they needed a filter for? Probably not the for the high voltage coil going to the spark plugs?
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Old 12-30-2019
79Ranger 79Ranger is offline
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Alternator noise and or relay/solenoid/contactor coils conducting that don't have a diode across the coil can induce spikes into the 12 volt system.


Quite impressive that BB used something that beefy. The choke seldom fails, the caps can dry out but are easy to replace.
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  #7  
Old 12-30-2019
badandy badandy is offline
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They likely used it because none of the PMMI devices (horn, clocks, control panel stuff, etc) has any circuitry to combat automotive 12v system problems, like load dumps and alternator noise.

White is ground, black is +12 from battery, and yellow is the filtered +12 output. I think. I don't know what the PCB is for there, but it has a darlington transistor and some kind of 8-pin IC doing something with or according to the relay coil power. Maybe it switches the relay on, has a delay, or something like that. My relay is not in the box with the caps. If there's nothing wrong with it I'd just keep using it.
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