| Re: Vacuum pump wiring help [message #313633 is a reply to message #313629] |
Wed, 22 February 2017 11:52   |
Tilerpep
Messages: 404
Registered: June 2013
Location: Raleigh, NC
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Cool, one question answered - the ground could be supplied through the vacuum sensing switch or the dash switch.
I read somewhere that the vacuum switch won't trigger until down to near 10 inches(?). Given that PO has pump plumbed to evacuate a three inch PVC pipe about 2.5 feet long (reservoir), and that is what is actually plumbed to the booster, I don't think it would run as much as without the reservoir.
But, your comment made me consider not using the vacuum switch at all - engine dies, burden is on me to throw the switch to activate relay and thus the pump. I have the PVC reservoir, so should have three activations of brake pedal to remember to turn on electric pump!
I could test/verify operation by ear and foot when I start the coach each trip.
How long does your pump run to pull down and stop? (and maybe a guess with a reservoir)
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
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