I'm trying to get a wire to power my headunit (in my 260C) that switches on in ACC and ON/START. According to the wiring diagram, the Blue wire in the loom (that goes through the fuse box, very convenient) should do that job. But it seems to be stuck on at 12V.

What Datsuns are these ignition switches in and have you ever heard of them stuffing up? I'm getting 12V through the wire non-stop. The ignition still turns on and off (obviously because the car works okay, but it doesn't have any accessories that I've had to test).

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1973 H230 Wagon, 'ILL-260'
1975 911S Targa
1978 Torana Hatch
1999 GXE10

Why can't you use the factory wires from the original head unit? i Usually just splice into them.

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Previous Stanza 80 model: L20B balenced for 9500rpm, big cam, twin 45's 100kW ATW.
Current Stanza 79 model: 1 owner spec http://ozdat.com/forum/viewtopic.php?f=62&t=23236
In progress 82 model: track car rebuild with above motor http://ozdat.com/forum/viewtopic.php?f= ... 40&start=0

The original head unit is an AM radio that I've never managed to get working, but it doesn't matter where I connect the wires to; if the ignition switch is faulty, the headunit will only be on when the ignition is on, or all the time. It should work in ACC and ON

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1973 H230 Wagon, 'ILL-260'
1975 911S Targa
1978 Torana Hatch
1999 GXE10

Ok, from memory the wires on your head unit should have:
Yellow = Constant 12V+ve
Red = Acc
Black = ground/earth -ve

Don't use the wires from the ignition barrel, find something from the fusebox. Hope that helps :/

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Previous Stanza 80 model: L20B balenced for 9500rpm, big cam, twin 45's 100kW ATW.
Current Stanza 79 model: 1 owner spec http://ozdat.com/forum/viewtopic.php?f=62&t=23236
In progress 82 model: track car rebuild with above motor http://ozdat.com/forum/viewtopic.php?f= ... 40&start=0

Man, I hate to be rude but what you're saying is completely missing the point.

I can find twenty different points of access to the blue wire (the 'accessory' wire in the Datsun loom) which the red wire of the headunit is supposed to hook up to, all after the fusebox. But that wire has 12V all the time and please tell me if I'm wrong, but I don't think it's supposed to have any power when the key is in the off position. I suck arse with electrics but I'm trying hard to learn.

I would love to know whether these ignition barrels are the same as any other Datsuns, and whether I can borrow another one to try or buy another one.

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1973 H230 Wagon, 'ILL-260'
1975 911S Targa
1978 Torana Hatch
1999 GXE10

Are you saying that the acc never turn off?

There is a constant 12v behind the dash, hook your memory to the constant 12v and the switch wire to the acc easy peasy

Yes.

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1973 H230 Wagon, 'ILL-260'
1975 911S Targa
1978 Torana Hatch
1999 GXE10

sure you haven't got the wrong wire, for me blue is constant 12v and blue with white stripe is acc, Try turning on your wipers with the car off?

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My garage:
180b sedan daily (needs some TLC)
180B sss (under restoration)
180b Wagon daily
http://ozdat.com/forum/viewtopic.php?f= ... 9&start=30

Just put it back together to do that test and now it's working as an accessory wire, switching off etc. The wipers are only working when the key ain't off, and the wire that I selected to be the full-time power supply to the headunit is now switching off too. Either me and my friend were tripping balls, or my ignition switch is inconsistent.

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1973 H230 Wagon, 'ILL-260'
1975 911S Targa
1978 Torana Hatch
1999 GXE10

cut back on the drugs??

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My garage:
180b sedan daily (needs some TLC)
180B sss (under restoration)
180b Wagon daily
http://ozdat.com/forum/viewtopic.php?f= ... 9&start=30