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Grease Monkey
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Grease Monkey
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OK, I know this has be discussed before, however I am confused which is not unusual. Here is the situation:
When I purchased this '47 the owner only told me one thing and was the car was a positive ground (and I could see that it was). I did the usual fixes brakes, fan belt, points, plugs,rotor, rotor cap, new batter, new cables ect.
Now I am almost ready to test drive it and I noticed a wire loose at the voltage reg. After looking much closer both generator wires are hanging loose and not connected. So now I am going to remove the generator and voltage regulator and take them to a shop for checking them out. The shop manger told me he could check them out and polarize them together. He took the serial off my old generator and looked it up on his computer and it stated negative ground. So I had my '42-48 blue shop mannual with me at the time and the diagram on page 12-22 shows the + going to the starter.
On the bottom half of the same page 12-22 it show the truck electrical diagram and it to show neg. ground. Now I thought all the time that it was positve ground.
Which is it???? Help
Need some feed back asap.
thanks
rsh47
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Joined: Jan 2002
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How is the battery wired? Positive to the starter or to ground.
It should be negative ground.
1946 Chevy 3100 1/2 Ton Pickup Purchased 11/18/17 Sold 9/20
1948 Chevy Fleetmaster Coupe, Purchased 6/20/2010
1965 Chevy ll 350 Purchased Feb 2021. 3-speed Saginaw Hurst Floor Shifter 3.08 Rear End
2019 Ford Ranger Lariat Super Crew
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Grease Monkey
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Grease Monkey
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Keith, when I put the new battery and cables on I put it back as it was and that was negative to the starter (which of course is positive ground).
But according to the shop manual it should be neg. ground. The reason that it confuses me is because I thought that I had read several times on the forum that that the '47"s where positive ground.
thanks
rsh47
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Joined: Feb 2008
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ChatMaster - 3,000
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Keith, when I put the new battery and cables on I put it back as it was and that was negative to the starter (which of course is positive ground).
But according to the shop manual it should be neg. ground. The reason that it confuses me is because I thought that I had read several times on the forum that that the '47"s where positive ground.
thanks
rsh47 VCCA forum stating '47 is a positive ground ? No, the 1947 is NOT a positive ground. Don't know of any Chevy being a positive ground. Here is a schematic from the '42 to '47 shop manual. NEGATIVE ground only. http://chevy.oldcarmanualproject.com/shop/1942_47/4247csm1232.htm
1951 Chevy Styleline Deluxe 2 door sedan / purchased from second owner 6-19-2000.
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ChatMaster - 15,000
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ChatMaster - 15,000
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Yes, Chevrolets are Negative ground.
How Sweet the roar of a Chevy four!
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Did it start and run with it wired for the positive ground?
1946 Chevy 3100 1/2 Ton Pickup Purchased 11/18/17 Sold 9/20
1948 Chevy Fleetmaster Coupe, Purchased 6/20/2010
1965 Chevy ll 350 Purchased Feb 2021. 3-speed Saginaw Hurst Floor Shifter 3.08 Rear End
2019 Ford Ranger Lariat Super Crew
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Joined: Dec 2015
Posts: 21
Grease Monkey
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Grease Monkey
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Yes, it starts and runs.
rsh47
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a link on this forum Note the first thread.
Russell #38868
'48 4 door Fleetline
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It is supposed to be negative ground. Recommend you do whatever is necessary to straighten it out. Charlie 
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Grease Monkey
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Grease Monkey
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The shop manual states neg. ground and all the forum feedback is the same, so I'm going to change back the way it should be to a negative ground.
Steps:
1. Switch the cables after I change out the terminal with correct colors red (+) blk (-).
2. Switch the wires going to the coil as follow: wire from the ignition to + (positive) and the wire to the distributor to - (negative).
2. I had a shop polarize the rebuilt generator and voltage regulator to negative. So, I think I should be ready to do this job.
I plan to do this Monday, but if you think I am doing something wrong let me know.
Thanks......rsh47
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If the ammeter read correctly then you will need to reverse the leads.
How Sweet the roar of a Chevy four!
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Grease Monkey
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Grease Monkey
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Everything changed over to neg. ground today and it runs very good.
thanks for the input from all.
rsh47
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