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3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr -
Those are very good drawings for comparison and reference. But there is one thing I would like to see that's not on there on the 12 volt diagram, which color wires on the coil terminals. It's simple on the 6 volt because there is no plus or negative symbol and if it's an original coil it can only be mounted one way. Or maybe not....png "upside down")
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Dennis, would it help if I said the Red wire is Negative and the Black the Positive in the 12v Negative chassis wiring? You can figure that the wire that comes from the ignition switch is the Negative to the points. For the points to work, the wire from the actual points needs to be grounded, so off the Negative post of the 12v coil.
The stock 6v Positive chassis is set so when you open the ignition switch, you remove the chassis potential from the coil to the points. In the 12v- system you are doing the same thing. it's the chassis wire from the coil.
I do hope that makes sense to you, and if you want to change, just ask, I will come down there and help you with the change.
J.C.You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!Comment
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No I know how it's supposed to be, I'm plenty familiar with 12v neg ground, mine has already been done, don't need any help.
It would be nice for less experienced people as I've seen postings in the past when people have asked.Last edited by Dennis; 09-09-2017, 04:35 AM.
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Here is the 12v coil hook up!
Black wire to the positive side of the coil.
Red wire to the negative side of the coil.
IMG_7337.PNG3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctrComment
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Too much work, I'll keep it 6 volts..png "cool")
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Very good as I'm in the midst of my 12v conversion. Thanks. PhilComment
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That is the reason I treasure this site. beautiful illustrations. great job.Comment
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Hi Mitch. I just got my Nurex fake pop out switch with the accessory terminal. Having read, and re-read the info above - I still have two questions.
1. I've owned Fords in the past - the key is usually inserted upside down. I've installed the Nurex switch - which is very nice with the three set screws - into the dash panel so the Key will be inserted "Teeth up"
2. The Negative side of the 12v Coil (red wire) goes up to the ignition switch. Does it go to the "common" terminal, so it will provide 12v when the switch is turned right, and 12v for accessory when the switch is turned Left?
It seems wrong for the accessory feed to draw current from the coil - but I don't see an alternative. Thanks again for your help.
Hope to finish up wiring this afternoon.Comment
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Well, I went 12v so I could add a radio, or a car charger for my phone, or whatever. My first car was a 1950 Hudson with a 6v Positive ground - didn't start well, and when I bought my 8-track player (no snickering)....
I had to put a 12v battery in the trunk and charge it all the time. It kept rolling around the trunk, and eventually the acid ate a hole in the fender.
So - have wired plenty of cars - but I have all the original wiring from the 6v system (everything new) - so I want to keep that. I have a 30amp amp gage. Purchased a "stock" 19" battery cable from Snyders - will probably
put it on the negative of the 12v battery, and ground to engine. Then run another lead from there to the frame.
What do you think?Comment
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So It sounds like you're wiring it stock. If you want to use the ACCY terminal it may be better to run it so the hot feeds the + side of the coil through the switch. Then run the red wire neg to the armored cable.
If you keep it configured stock then the red wire will go to the ign and the armored cable to another ign term. I don't believe this will be a good way to power an accy.
Regarding the switch make sure you have it adjusted all the way forward away from the tank. Also insulate the terminals to prevent the terminals from grounding on the gas tank.
I had them adjusted away and they still hit sometimes
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I'll run the switch collar all the way down.
So if I follow you from above, I run a jumper wire from the Right Terminal (Yellow/Black) up to the common terminal on the switch. I have another spare yellow/black wire I could use. Then I could
re-use the Red wire from the switched side of the ignition down through the terminal box, and on to the coil - to the Positive + side. Then I connect the Armored cable from the distributor to the negative side
of the coil. (I do have the short armored cable) Now... should I pick up my 12v for the switch before it goes through the amp gage, or after. (yellow/black or yellow). I see they show the Instrument light powered off the minus side of the amp gage on the drawing above.
I checked Nurex's site to see if they had any diagrams for the accessory switch - but no luck.
Thanks again Mitch.Comment
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This gallery has 1 photos.3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctrComment
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When converting my A to 12 volt I've heard that you have to switch the two primary wires on the coil. Which small primary wire goes to positive and which to negative side of coil?02-22-2019, 09:55 AM -
Was told today that the dist wire going into the dist should be connecter to the + side of the coil I HAVE A 12V system Is this correct or have I been given bad info ?03-17-2022, 06:35 PM -
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Attached is a dwg. from the net that may be helpful. It also shows how to locate a condenser away from the dizzy and up at the firewall. If an oil filled coil is used, the diagram has the terminals facing up requiring a longer coil to dizzy wire....02-13-2018, 06:15 PM -
Installing a new ignition system, my question is a two parter...question 1: the terminals on the key switch are a top and bottom configuration, does the red wire hook up to the top or bottom or does it make any dif.2nd: which side of the coil does the other end of the red wire hook up to, the pos + side or the neg- side? Vehicle is still a 6 volt pos+ ground....02-04-2022, 12:37 PM
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Still trying....I posted that my car was blowing the fuse on the starter after I changed from 6v negative to 6v positive. The alternator is a one wire alternator. I've disconnected everything and started to rewire and it didn't take long to get stumped again. The aftermarket ignition switch only has two connections, one is marked "coil" the other "battery". I have a red wire that...10-29-2022, 12:25 PM -
Would wiring the coil red wire to negative on the coil cause the coil to overheat and fail. Someone had replaced the coil in the past with a std. brand with the red wire on the passenger side of the car connected to the minus terminal. Thanks, Rick.10-26-2021, 11:40 AM -
The 6v battery on my CDN made 30 A pickup was toast so I purchased a replacement. When I went to hook it back up I noticed it been hooked up Negative ground. I had assumed it was positive ground.
Is it possible the PO reversed it when he installed it last? I have not yet had it out, only checked it over and replaced the tires etc. I have only run it to put it in and out of the trailer picking...03-01-2020, 04:58 PM -
Is there any issue with mounting the condenser up at the coil? 12 volt system with 16ga wire, internal resistor coil, etc. .03-11-2018, 07:55 PM
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While prepping my 30 Coupe for a big car show next week and hoping to bring home the gold I noticed that both the coil and bracket on the firewall both looked a bit shabby and decided to give them a good cleaning and spruce them up a little. So, I grabbed the necessary tools and removed them both cleaned them up to be more presentable and then upon replacing the coil to the firewall I discovered...08-06-2021, 11:23 PM
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