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04-25-2021, 06:20 PM | #1 |
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positive ground vs negative ground
Maybe some of you engine specialist can help me with this. What years were Y block, OHV, V-8 engines manufactured with 6 volt negative ground, and is/can the grounding be changed when converting over to a 12 volt system? Thanks.
James |
04-25-2021, 06:25 PM | #2 |
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Join Date: Aug 2012
Location: Abq, NM
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Re: positive ground vs negative ground
'54 was the first model year for Y-blocks and '55 was the last year for 6 volt Positive ground. There were no original 6 volt Negative ground Y-block Fords that I'm familiar with...
Changing the 'ground' is much easier than the rest of the work to change to 12 volts. Here's a link to an information page. It was written for '55 T-Birds but 99% of it will apply to other ('54/'55) 6 volt Y-block Fords. https://www.ctci.org/battery-for-6v-to-12v-conversion/ What vehicle are you working on / asking about? . Last edited by dmsfrr; 04-25-2021 at 08:53 PM. |
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04-26-2021, 08:56 AM | #3 |
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Re: positive ground vs negative ground
Thanks for the info. Right now I am converting a 55 Y block 272 to 12 volts. As I remember, these distributors operate at about 7.5 volts by using either a resistance wire, or, a ballast resistor. I want to use a ballast resistor, but can't remember which wire it goes on. The engine is out of a 55 F-150, but I only have the engine, no body. Plan to put in something else later. Any help would be appreiated.
James |
04-26-2021, 03:47 PM | #4 | |
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Re: positive ground vs negative ground
Quote:
It goes on the primary wire that goes from the ignition switch to the coil. Also, the coil may need the primary wires switched. The primary terminals are marked "+" and "-". On a negative ground system the negative or "-" terminal goes to the distributor. On a positive ground system the "+" terminal goes to the distributor. |
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04-26-2021, 04:36 PM | #5 | ||
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Re: positive ground vs negative ground
Quote:
Quote:
In this diagram the large right-side terminal of the starter solenoid is shown as the connection for the Positive battery cable. In many/most Y-block powered cars and trucks the large left-side terminal is used for the + battery cable, it makes no difference. . Last edited by dmsfrr; 04-29-2021 at 12:10 PM. |
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04-26-2021, 06:45 PM | #6 |
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Re: positive ground vs negative ground
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James |
04-29-2021, 02:21 AM | #7 | |
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Re: positive ground vs negative ground
Quote:
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05-04-2021, 09:18 AM | #8 |
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Location: Venice, FL
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Re: positive ground vs negative ground
My car is still 6V+ and I could use some of your old 6V+ parts if you'd like to get rid of them. Just PM me. Thanks, John 54 Mercury
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05-04-2021, 11:12 AM | #9 | |
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Re: positive ground vs negative ground
Quote:
Depending on what vehicle you put the engine in the Temp sensor should match the Temp gauge in the dash. The threaded bushing near the rear of the left head is replaceable and has two internal thread sizes: 3/8 pipe thread for '56 and earlier or 1/4 inch pipe thread for the '57 & later. Last edited by dmsfrr; 05-04-2021 at 11:20 AM. |
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