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Is there an after-market shop manual that covers the GN? My Chilton's for '75-'87 Regal/Century doesn't seem to know that the GN exists.

It also doesn't seem to know anything about the Powermaster brake MC. I'll probably have to buy a FSM to get decent wiring diagrams that show the pin-out for the pressure switch and pump motor. Which year(s) of FSM would be best? I have found FSMs for '84, '86, and '87. The '87 is, I think, an adjunct to the full FSM, with GN-specific information, only.

Thanks

Larry
 

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The GM shop manual covers the PM in pretty good detail. If you don't want, or can't find, a whole shop manual, Kirban's has a little book which just covers the Powermaster, pretty much the same stuff as in the GM factory manual.
 

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It was verbatim from the GM service manual, which is why it is no longer available/offered for sale.

HTH :)
 

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Larry:
Is there an after-market shop manual that covers the GN? My Chilton's for '75-'87 Regal/Century doesn't seem to know that the GN exists.

It also doesn't seem to know anything about the Powermaster brake MC. I'll probably have to buy a FSM to get decent wiring diagrams that show the pin-out for the pressure switch and pump motor. Which year(s) of FSM would be best? I have found FSMs for '84, '86, and '87. The '87 is, I think, an adjunct to the full FSM, with GN-specific information, only.

Thanks

Larry
Ok. This may help you out Larry.
I have 1 Power Master Book that I ordered from Postons. The first page says From: Delco Chassis Technical Assistance.
The booklet shows the electrical pins as follows:

Pressure switch- from reservior to firewall. (C B A)
Pin C = Ground
Pin B = Combination valve/Brake warning light.
Pin A = Pin D on Pump Motor.

The booklet shows the electrical pins as follows:

Pump Motor- Engine to Fender. (D C B A)
Pin D = Pin A on Switch.
Pin C = Battery 12 Volt 30 Amp Fuse.
Pin B = Ignition.
Pin A = Ground.
That is what the book shows.
Look for your grounds and go from there ok.
Also. Note that the Powermaster system is tied into the following electrical circuits.
(Taken from the booklet)
On the Regal, the indicator light works off of the 20 amp gage fuse, the relay off of the 25 amp A/C fuse and the motor off of the 30 amp courtesy fuse.
If you have anymore questions. feel free to ask.
Hope this info helps you out.
 
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