I think I've got this but thought I'd try and check. Looking at a double throw double throw switch, so dpdt, in on off on configuration.
I'm wanting to control 2 circuits with one switch. Let's call them a and b. Off = both off. On one of the ones = a and b both on. The other on = a on and b off ( as b not connected).
Am I on the right lines?
Chris
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Hi Chris,I would be thinking single switch to activate two relays,or maybe a double output relay maybe might be possible,but I'm sure someone will come along other than me that knows what they are talking about.
Change over switch ? Or a change over switch with off in the middle ??
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On off on, so kind of a changeover with off in the middle.
I've found a schematic ( that I can't download to show) which confirms what the switch will do and is what I need, with some minor modification, naturally!
I could achieve the same end with 2 separate on off switches, but where's the fun in that, and besides, the single switch functionality will be an improvement!
Chris
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You should look for an old style side/headlight switch.
Pull on = sidelights, pull further = side and headlights.
Don't think they are double pole though.
Here it is! Done gangsta style!
Chris20250104_190556.jpeg
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Just to confuse!
Only the 2 upper bulbs will be used.
The sources on 2 and 5 will come from different places.
Terminal 1 will go to terminal 3 to the light.
Terminal 4 will be unused.
Simples! Ha!
Chris
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as bill said above, just use a headlight switch. 1st position will switch 1st circuit and 2nd position will switch 1st circuit 'and' 2nd circuit. using an on/off/on switch just adds complication. the headlight switch does it all for you.
neil.
Yep, got that thanks, and agreed on the headlight switch to a point, but I'm looking to utilise 2 separately switched sources of power also. Its a rather unusual application, somewhat experimental!
Chris
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That should cover it ...Screenshot_20250105_092846_Chrome.jpeg
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Cheers John. Isn't that one overly complicated though? I'm looking at this one, cheaper too! Has the 6 terminals I'm looking for.
https://www.ebay.co.uk/itm/156476257...mis&media=COPY
Screenshots beyond me abilities!!
Chris
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Ah ha, power and volume! Easy enough to remember!
Chris Screenshot_20250105-101436_eBay.jpeg
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Bumper sticker - This is an historic vehicle and only has three speeds....... if you don't like this one you sure as hell won't like the others.
Simpler for sure as long as it has enough switching ability ?
Yeah, no problem there, just some led lighting, 7w I think, so about 0.6A, well within capabilities.
Chris
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Last edited by Happydaze; 05-01-25 at 12:24 PM.
Bumper sticker - This is an historic vehicle and only has three speeds....... if you don't like this one you sure as hell won't like the others.
red lights over the rear axle and around the engine for full on 70's night use?Originally Posted by Happydaze
neil.
ps if it's only for light load led's what's the reason for the 2 seperate power supplies you mentioned?
Not that far from the truth!!!!!!!red lights over the rear axle and around the engine for full on 70's night use?
neil.
ps if it's only for light load led's what's the reason for the 2 seperate power supplies you mentioned?
Here's the full explanation...... I think!
I'm messing with one of those 'f1' led units. I'm wanting a 3rd brake light and something like a rear fog light, as I'm getting a bit paranoid ( Sabbath just come on the radio, really!) in a drab green car with small rear lights, unattentive drivers etc.
If I proceed further with it this it'll be easily removable, with plug in wiring. Also, I want it switched.
Anyway, the unit has 3 wires: earth, brake light and running light.
The brake light will be wired to the 3rd brake light wiring that's currently unused. The light operates with a number if stroboscopic bursts before going on solid. Apparently uk illegal uk OK EU, go figure, and it's OK for bmw!
The running light is a brief flash every couple of seconds or so and is illegal. This would be powered from the tail lights or ignition.
I want it switched so it can be totally off, both systems on, or just brake lights. I'm imagining it would be on brake lights only unless conditions suggested taking the illegal route of fear of being rear ended being greater than the risk of being busted. Being rear ended by the coppers isn't a scenario I've considered!
My next challenge is trying to make this not look like a pile! I doubt it'll ever look great, and my in-house crew are barfing as we speak! The way I see it, if it's hideous it'll be removable with a GoPro type slide mount and a plug in, guitar or similar type plug in, so might never be seen. If that fails it'll be clip mounted to the numberplate with a plug in in the trunk.
In a test it seems suitably bright, so first objective achieved.
Pic to follow.
The existing tailights have led bulbs to replace the stock style but having seen Kev Fosters led taillights at the supernationals in the sunlight I'll be getting some of them, United Pacific. When unlit they don't look like the stickers but I can live with that.
Plan b, or is it c, is a different unit on which the running light is solid, not flashing. Assuming that's a full power illumination that would work as a fog light, and be legal. But I quite fancy the blinking light if at night on fast A roads, motorways etc, irrespective of the legality! It's all experimental!
After this I'll be looking at prop loops. More experimentation, but no electrics!
Still awake?
Chris
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Pics of test illumination, unit connected to separate 12v source, so tail lights not lit.
20250104_145236.jpeg20250104_145453.jpeg
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Last edited by Happydaze; 05-01-25 at 05:07 PM.
Bumper sticker - This is an historic vehicle and only has three speeds....... if you don't like this one you sure as hell won't like the others.
Could you not just mount it sideways and leave it permanent in the brake light circuit ? seems a better idea too have it permanently in use ? Dunno about the clock feature it has tho
Mounting orientation isn't finally determined yet! If I can make it look acceptable then it'll probably be as good as permanently installed, but having it removable is little effort and cost. Ditto switching.
The numbers are a head up display of the speedo that the coppers following along can check! Good eye!
Chris
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Bumper sticker - This is an historic vehicle and only has three speeds....... if you don't like this one you sure as hell won't like the others.
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