- I did confuse posters. Alas my old habits are returning - I'm not reading WHO posts, merely the post content. (That's something that is not too bad on the12volt, but on other sites I have learned to ignore the in-butters. IMO if they want to tackle me, they should open a new thread.)
Of course I could blame Steve for butting in (LOL), but no - IMO his question was quite acceptable and not (yet) a hijack. However that is up to the OP (you, webpager) to decide.
Maybe it does show why some prefer a new thread to be opened by new posters or for related questions. The new thread can refer back or include a link to the original, and the original could have "(rather than hijack or complicate this...) See my new thread ABC
Ah - so many new names and members. Steve and HarryH are even newer than you. OldFarts like me get so confused. (Get? I am always confused!
Anyways, your diagram looks fine by me.
You can turn on any slave but they will not turn on until you manually momentarily push the "Master" momentary switch.
ACC must be on for the Master to come on.
The Master relay stays on/energised until ACC loses power.
When the Master turns off, all power is lost to the slave devices/relays.
Be aware that ACC drops when cranking. (But...)
All slaves with SPST switches turned on will turn on again once the Master is re-energised - eg, another manual push after cranking.
Oh no, stupid me. I wrote the following and then realised it's wrong because of the latching aspect - you have to turn OFF the Master Relay's power (#87) to drop
it and hence slave relays/loads.
However adding a manual off as per 2nd (circuit) diagram could overcome that.
Also be aware that the Master Relay's power can be direct from battery +12V. Only the Master momentary switch need be powered from an ACC circuit. The advantage is that your slave loads do NOT load the ACC circuit, and the slaves get the 'cleanest' +12V power - ie, direct from the battery (via a fuse of course). The latter is often preferred by audio buffs, maybe PCs, or those with noisy loads (inverters etc).
Ah yes, we "experts" never make mistakes do we? (Readers - please ALWAYS be wary!)
At least that saves me the no drop during cranking
BTW - I looked up "drop relay" and found "Relay activated by incoming ringing current to call an operator's attention to a subscriber's line.
" (from The Free Dictionary (by Farlex)
Man, that's so pre-1930's!
FYI - for those that think only "experts" achieve etc, the automated telephone switch (exchange) was invented by a Funeral Director. It's yet another of many "as if other's can't have valid input