flyray

Hey guys, i know this question has been answered before but i cant find it in this forum.Is a 41 series 76 with flathead 6 positive or negitive ground? Currently mine is negitve ground, but was told its backwards.

Ozzie

There were some 6 volt positive ground systems on some other brands, but I suspect that yours is a negative ground. I have an old Motor's Auto Repair Manual that covers from 1940-1955. While it doesn't directly show the system polarity, it says that all the regulators are negative grounded. My 1955 Olds is a negative ground system, hence I suspect that yours is also.

Tedd Thompson

X2 on the above from Ozzie. A friend had a 40 and I helped him work on it regularly and I don't remember it being a positive ground....Tedd

redoldsman

Back in the day, Ford's had a positive ground. I suspect that changed in 54 when they went to the ohv engine but might have continued until they went to 12 volts in 1956. All the flatheads were positive ground. I don't think GM ever was but don't know for sure.

66trakpak

I have a 40 Cadillac which is positive ground if it helps.

steverw

My friend had a 61 Ford Econoline van that was positive ground.

Steve