Ford 9N polarity

Fergie Mad · Apr 16, 2023

Can someone tell me how to polarise a ford 9N dynamo please.

wore out · Apr 16, 2023

Momentarily jumper across the two terminals on the cutout.

John T · Apr 16, 2023

From what little I know about older Fords (Im NOT a Ford man) some 9N's used a round Cutout Relay while others a Voltage Regulator. Sorry I don't know what you have or even if the 9N used a Class A or a Class B charging system ?? For Class A's, similar to posted below, to polarize I momentarily flash jump BAT to GEN/ARM regardless if it's a Cutout Relay or a VR. Even if such works for polarizing a Class B, on Class B charging systems my preferred method is to momentarily flash jump BAT to the Gennys FLD terminal.

You might want to post this over on the Ford Forum. Heres a thread that may be of interest:

https://forums.yesterdaystractors.com/viewtopic.php?t=1330336

John T NOT a Ford man, no warranty, ask those gents
Ford Charging

Fergie Mad · Apr 16, 2023

I have a cut out relay system so il try that

wore out · Apr 16, 2023

(quoted from post at 13:10:29 04/16/23) I have a cut out relay system so il try that

Yes, for sure if charging system has not been modified from as it left the factory it is an ''A'' system and momentarily jumpering across the cutout WILL polarize it ASSUMING the generator is in working order.

Fergie Mad · Apr 16, 2023

Its a new dynamo thats been fitted.

Ford 9N polarity

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