6 to 12 volt conversion.

I have a traction 11c converted to 12v it uses a dynamo and a 12v lucas voltage regulator also the original starter with no other modifications

note there is no voltage at the fuel tank sender only resistance

12v Alternator, CTA in Holland do a full kit with bracket etc. it’s a straight swap for the 6v dynamo and throws out double the amperage of a dynamo but not cheap: http://www.ctaservice.nl/product/14266/dyn-wisst-12v-75amp-steun

12v to 6v reducer, I have a similar to one of these https://www.amazon.co.uk/DIGITEN-Waterproof-Converter-Regulator-Module/dp/B018LFV0S6  fitted to my car for the wipers (which I upgraded the arms and blades for)

It really depends on how much ‘wet weather’ driving you envisage doing (I do try and avoid it as wipers are only 1 issue, a lack of demister is another)

As for running a 6v starter on a 12v system, well it may be fine for years, but any weakness in the motor could leave you stranded as I was at the 80th out in France until we managed to do a deal with another member who had a spare 12v starter, but those are becoming hard to source unless you go for a modern replacement like https://www.autoelectricsupplies.co.uk/product/1517/category/217

It really does come down to how deep your pockets are, how and how often you are going to use the car as a lot still run fine on 6v.

Purists – look away now…

This is how I fitted my alternator. It’s a Lucas 17ACR (£55 from Moss-europe) with a different pulley to accept the original wide belt. The brackets are cut from a strip of steel that used to support my rear bumper.

You can see I fitted a heat shield because I was concerned the plastic cover (and the regulator inside it) were a bit close to the exhaust. It may not be necessary but I didn’t want to find out the hard way. The alternator runs a little slower than it would in its intended installation. That meant I needed to have a lower resistance ignition warning light – so I wired 2 Halfords warning lights in parallel which seems to work quite well. I converted all the bulbs to 12V – I have lovely halogens up front – but I left the 6V starter alone – so far (30,000 km) so good (touch wood!). The wipers and fuel gauge run off a solid state 12V to 6V converter (there a loads on ebay for about £10) which is wired through a relay so it is only live when the ignition is on. That sits on the bulkhead next to the redundant voltage regulator. I think it might get a bit hot there as occasionally I lose the 6V – it would probably be better mounted inside the car.

With the headlights on the switch gets very hot so I intend to put some relays in there when I get the time.

So – not pretty, but cheap.

Chris

Good question.

One of these is holding my bumper on: 

The one that came with the car was similar – but about 6 inches longer and the bumper was a weird shape as a result.

Chris

Just to add (I couldn’t edit the post) for info on alternator pulley size take a look at the Prestolite guide http://www.prestolite.com/pgs_support/pulley_select_guide_b.php?pf=true&

I cannot identify the wiring  within my 1935 Citroen Traction. It was changed from 6V to12V in  early 1980 in France, so i presume it was fitted with a French wiring loom. Does anyone have a wiring diagram copy of what i have or any idea where i could source one from. My email is k.barcham@btinternet.com .