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PARTS LIST: 6v to 12v conversion for 1947 Caddy (+ electronic ignition)

Started by Justin Norwood, February 16, 2018, 09:48:44 AM

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bcroe

Quote from: Bobby BNo rewinding needed. There's a 12V compatible motor for your car that fits nicely to replace the existing 6V one. I have three of them in my '47.  Under-Dash Blower and the 2 Underseat Heaters.  Bobby 

That is a great solution.  Remember the slow speed resistors for a
12V motor need to be 4 times the resistance of those for 6V. 
Bruce Roe

jackworstell

Bruce in a comment post above....you recommended

     voltage spike protection for the buck converter
      filter on inlet
      filter on the outlet

https://www.ebay.com/itm/GEREE-Mini-Buck-Voltage-Converter-DC-to-DC-Step-down-Transforme-Free-Shipping/272665596273?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Would you provide
    specific info on what components to order  eg part numbers      from
       Radio Shack or similar ?
    exactly what the protection circuit on the inlet should look like ?

We have a 6V negative ground system   with a standard 30 amp generator

I want to follow your advice and I have a little electronics knowledge but not enough to get thru this without some very
specific help.   And I think others could take advantage of  specifics you might provide.

Thanks    Jack Worstell       jlwmaster@aol.com

bcroe

Quote from: jackworstell
Bruce in a comment post above....you recommended

     voltage spike protection for the buck converter
      filter on inlet
      filter on the outlet

Would you provide
    specific info on what components to order  eg part numbers      from
       Radio Shack or similar ?

I think others could take advantage of  specifics you might provide.
Thanks    Jack Worstell       jlwmaster@aol.com   

When I was driving my 62 to 220,000 miles, I started adding electronics
using 50V rated parts.  There were a few failures over months, the cause
was traced to very short voltage spikes (microsecond) of up to 300V. 
These were caused by contacts/commutators operating inductive
loads, esp starter motors, but also horns, AC clutch, and other things. 

To the power terminals (mostly input, but sometimes output) of
sensitive electronics, were added protection networks.  These can
be noted on transistor radios, etc.   My favorite device is made by
Diodes Incorporated, Part Number     1.5KE24A-T   uni-directional
This is a Transient Voltage Surpresser Diode or TVS DIODE form factor
DO201 (pastic diode, 2 short leads) which is wired so as to normally never
conduct (cathode, or bar symbol to positive terminal), but shorts out
out-of-range voltage of either polarity.  Below 24V its normally inert,
but still can protect most electronics.  In reverse direction it is a diode
short circuit, I think better than a bi-directional device which would allow
24V in reverse. 

If there is an on/off switch, the device should be wired on the load side. 

Cost $1, the shipping will kill you.  I buy them by the 100 (@ $.52) for
car electronics.  I see the 1.5KE24 on Evil bay, also industrial suppliers
like DIGIKEY, MOUSER, NEWARK.  PLEASE DON'T just order one
and say I sent you, they might disown me.  Probably not Radio Crap. 

Usually I put a line filter cap in parallel with the diode, these are not at
all critical.  I will need to search a little and pick a cap.  Bruce Roe

jackworstell


g4h1949

Will this part list work for 1941 Caddy also, can you list anything else I might need to convert over to 12 Vdc.
James Charleston

Maynard Krebs

Quote from: revvies on February 17, 2018, 10:39:01 AM
A few reactions:

4) Does anyone have a battery recommendation? ...or even just specs that I should be considering?

Thanks again!
-Justin

Justin,

   While I don't have a battery recommendation, per se; I strongly urge you to install thick-diameter battery CABLES:  as thick as you can find.   I would recommend at least 2-gauge... maybe even 0-gauge.... yes, even at 12-volts.   

   The only other thing that I would stress is cleanliness of electrical connections:  free of paint, rust, dirt, oil, etc..