Re: Pusbutton schematics.

Posted by HH56 On 2011/9/9 10:37:21
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BH wrote:
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The park relay is NOT affected by the pressure sw. WHICH MEANS that if the ign. sw. is turned OFF while at speed then the system will attempt to shift the trans into Park.

Auto-Lite even admits this in their Service Manual for the pushbutton control.

I'm wondering why Packard didn't wire the auto-park relay to the pressure switch, then.

Seems to me that if you remove the green wire on the park relay that is fed from the circuit breaker, and then run a new wire from that same relay terminal to the pressure switch terminal that feeds the selector buss bar for the "N", "R" & "P" switches, that problem could be alleviated. No?


If I understand your suggestion correctly, I think no. The feed for the pressure switch comes from ign switch so when ign switch turned off, there would be no voltage to pressure switch or PBs so everything would stay in the state it was currently in. With the way they did it, key off, relay drops out and connects the battery to the park terminal in selector directly just as if the button were pushed.

It is a downside for sure and I'd bet responsible for more than one interesting experience.

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