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6 to 12v conversion

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Old Feb 14th, 2020, 09:45   #11
arcturus
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Not converting to neg earth. The dynamator is something for the future.My pockets are not very deep. I will probably fit a DR to solenoid.Get the system up and running first.
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Old Feb 14th, 2020, 09:47   #12
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Quote:
Originally Posted by Ron Kwas View Post
Arcturus;

In series with Ign Power supply to Instrument, and external to Inst is fine (IOW, Inst does not need to be removed to add DR...you could simply add it externally, between supply [there are multiple wires as terminal is used as a common tiepoint] and Inst power terminal).
Like so:


See also: https://www.sw-em.com/Fuel%20Gauge%2...nstrument_data

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Thanks Ron. I expected that to be the case. Just wanted to be sure.So the resistors won't affect the rest of the circuit? It could actually be installed at fuse box?
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Old Feb 14th, 2020, 10:24   #13
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Quote:
Originally Posted by arcturus View Post
I will probably fit a DR to solenoid.Get the system up and running first.
It would probably be cheaper to fit a 12V solenoid and have done with it.

https://www.autoelectricsupplies.co.uk/product/1111

Most solenoids take about 30A to pull them in and a bit less to hold them so you'd be looking at a 0.4 Ohm resistor to drop the voltage. Becauses of the current involved, that resistor would need a power rating of around 200W which won't come cheap.

https://uk.rs-online.com/web/c/passi...ons=4292049435

Choice of 6 there, ranging from about 21 upwards. In other words, about 50% more than a new 12V solenoid!
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Old Feb 14th, 2020, 15:10   #14
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Solenoids are not interchangeable.See attached
the full article. https://www.sw-em.com/Vintage_Volvo_...conversion.htm
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File Type: jpg solenoid.JPG (147.7 KB, 6 views)
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Old Feb 14th, 2020, 15:21   #15
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Quote:
Originally Posted by arcturus View Post
Solenoids are not interchangeable.See attached
the full article. https://www.sw-em.com/Vintage_Volvo_...conversion.htm
At the end of the paragraph before the one you've highlighted, it says "The solenoid on the other hand doesn't have the ability to withstand a doubling of the operating voltage for too long...and so it should be replaced with a later 12V type. I believe these are physically compatible"

In other words, exactly what i suggested in my previous post!

Just for clarification, it is an inertia starter with a separate solenoid and not a pre-engaged starter with the solenoid piggy-backed onto the starter motor body?

As for using a dropping resistor for the instruments, have you considered using an LM7805 5V voltage regulator with a couple of 1N4001s in series with the common (0V) leg to give 6.2 - 6.4V?

Much nicer than DRs for each gauge and more reliable with less heat.
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Old Feb 14th, 2020, 15:49   #16
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Piggy back and not interchangeable. From conversation with others the solenoid doesn't present too many problems. I think that Ron will confirm this.
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File Type: jpg 20200214_01.jpg (272.0 KB, 6 views)
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Old Feb 14th, 2020, 16:57   #17
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Pre-engaged then. I don't see why you can't find a 12V replacement starter complete.

Oh well, it's your car, your effort, your money, you do what you want but i wouldn't want to run a 6V starter on a 12V system, it won't last long but could easily catch fire.
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Old Feb 14th, 2020, 18:47   #18
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I inquired about a starter from B18 but doesn't fit but thanks anyway for all your suggestions.I may have a look at the resistors.I was thinking about connecting through my Dale 50 watt but not sure about that. The ones I have connected up to wipers, two il parallel connected in series to wiper motor,obviously not good enough.
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Old Feb 15th, 2020, 11:09   #19
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Ron, re fuel gauge, Is this the sort of thing that's required (just a dummy experiment) taking the wire from fuse box. (easily accessible) ? Have i understood it correctly?
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Old Feb 15th, 2020, 16:01   #20
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arcturus;

I don't quite understand your question, but essentially, you need Ign power to supply the DR, and this in-turn supplies the Instrument. Where you get Ign power from is non-critical, so it could certainly come from Fuseblock, but since Ign power wires need to be removed from Inst. anyway, they are (already!) right there, so it makes sense (is simplest!) to reuse them to supply DR, as shown in my sketch.

I hope that answers your question, and makes it a bit clearer.

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