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    Source of nylon fastening - UK based

    Ebay has them for half that and no post cost if you want to wait a couple of weeks. https://www.ebay.com.au/itm/25-100x-White-Plastic-Nylon-M2-M2-5-M3-M4-Round-Pan-Phillips-Head-Screw-Hex-Nut/323015811643?hash=item4b353e223b%3Am%3AmB5cadn-gwxdBMHasTBIM3g&var=512150617283
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    10v -14v input to 12v regulator circuit high current

    No good if the battery is way down on charge, as quoted 10.5v.
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    10v -14v input to 12v regulator circuit high current

    Doesn't appear the Op's input voltage level is a problem but rather ( as you say) the amount of energy being put in to the battery bank in the first place. Request for a regulator was on the output (incorrectly) as I assume because he wanted to boost the 10.5v upwards along with his 14V down...
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    10v -14v input to 12v regulator circuit high current

    Still sounds like you are not getting enough charge into the battery during the daytime. Sadly for you, this is not the type of thing one can point a multimeter or your guesstimate finger at and get any useful final conclusions. e.g............. Starting point for you to follow...
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    10v -14v input to 12v regulator circuit high current

    I thought requirement originally was regulator on the output, seems like it now. Again, you need more than 12v output to regulate to 12v as I explained above. You cannot get 12v output through a regulator that is only supplied with 10.5v. 12v from 14v, marginally, yes, but not 12v from 10.5v...
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    10v -14v input to 12v regulator circuit high current

    Where are you taking your voltage readings? How long are you discharging at 10A? How much capacity is being fed into the battery before discharge? How are the 2 * 12v batteries connected? Sounds like you are not getting enough into the battery during the day for night consumption.
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    Resistor for motor to slow speed..

    And if you are using smoke alarm battery , forget it.
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    10v -14v input to 12v regulator circuit high current

    For a regulator the input has to be higher than the output by at least 2 volts normally to allow for voltage drop on the regulator itself. Quite high means nothing, you need to provide actual figures.
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    Limiting resistor for High Power LED

    BTW, the above #2 was to give an indication of what is available. There are 5v units if you care to look. Here is an example...
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    Limiting resistor for High Power LED

    The reason drivers are used is to keep the current constant. If you want to use a resistor, fine but any voltage variation will change the current and resistors burn up energy, get hot and are inefficient. To calculate resistor size, subtract led voltage from supply voltage and using basic grade...
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    Limiting resistor for High Power LED

    Maybe use a 1 to 3W LED driver. Available from Ebay for a dollar or so. 1-3*1W LED Driver Wattage：1W Input Voltage： AC 12V Output Voltage：DC 2.6.-3.6V Output Current：300MA 　 3*1W LED Driver Wattage：3W Input Voltage： AC 12V Output Voltage：DC 6-11V Output Current：300MA 4*1W LED Driver...
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    Help with Crosswalk Signal - Man Lights Up. Hand Does Not.

    Mostly they will need to be the analog type meter.
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    Help with Crosswalk Signal - Man Lights Up. Hand Does Not.

    Could be series parrallel LEDconnections with a drive transistor dropped out. Bit adventurous for a first timer I would have thought. Might have been dropped getting it off the post.:) :)
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    What type connector is this.

    There are different versions of jst as you have already stated. It will depend on pin pitch. Most balance plugs are 2.5 which make them JST-XH. They come in a varity of pin numbers. If you do a Google search you should be able to find a table which outlines the different ones. Just be aware...
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    Need a little inspiration

    Discharge for storage is normally looked upon for long term storage. Don't see the point really given most packs are Chinese these days for cost reasons and would never live up to claimed specs. Other than that There are battery capacity testers that can handle over 100w. If not suitable as...
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    12v relay staying on

    Auto headlight wiring arrangements can get tricky with a constant feed to the lights and switching the earth return. Tapping in in the wrong place can create feedback which can do what you describe. +2 for Dave9's advice, get an auto lecky to set it up properly. Without seeing an exact drawing...
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    Off the Shelf Logic Gates?

    Usually come in quad gates per pack and Nand gates are usually more common. Use 4000 series for 12v. CD4081 https://www.ebay.com.au/itm/2pcs-CD4081BE-DIP14-CD4081-Quad-2-Input-Or-And-Gate-Original-DIP-14-TI-Chip-IC/232453339718?hash=item361f4c7a46:g:EX0AAOSwR5VZlvWG Just be aware they are Cmos...
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    "Automotive" Electrolytic Capacitors on a PA Power Supply PCB?

    Best idea when you are after info is provide as much detail as you can. You may be able to see what you are referring to but we cannot. Can you simply provide a link at least?
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    Power Supply Cap Basic Replacement Advice

    Power supply problems can be crook caps but I don't see any indication of that. Glue is just glue, anything would suffice, hot glue, bear contact cement. As far as in-circuit testing, don't think you can rely on that as other components may have an affect on the readings.
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    How to monitor an actuator's feedback line from a microcontroller?

    Maybe like this....
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