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Oil Pressure Light after .3 switch wire touches exhaust
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jslew
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Joined: March 03, 2008
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Location: Trinidad, CO
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PostPosted: Sat Sep 20, 2014 10:43 am    Post subject: Oil Pressure Light after .3 switch wire touches exhaust Reply with quote

I have an oil pressure gauge in my vanagon w sending unit & switch mounted to tin under push rods.

Was changing coolant, so pulled tin & left sender hanging. After draining coolant, disconnected .3 switch wire (to gauge cluster) to wipe coolant off and forgot to plug it back in.
Went driving & oil pressure light starts flickering - go home & find dangling .3 wire with just the connector resting on exhaust - plastic guard around connector had melted - no breaks in wire... no exposed wire. Plugged it back in. Went driving - oil pressure light still blinks.

I know i have good oil pressure, as my gauge still functions correctly (50psi above 3000rpm, 18psi at idle).
Changed out .3 wire all the way to connector in engine bay & went driving... still blinks.

Tested dynamic oil pressure system per bentley:
engine not running/ignition on - LED flashes - Yes.
engine <2000rpm/.3 wire grounded - LED flashes - Yes.
engine >2000rpm/.9 wire unhooked - LED flashes + buzzer - Yes.
Everything checks out.

Did .3 switch go bad? Can driving w/o .3 switch wire plugged in mess up the switch?
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jslew
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Joined: March 03, 2008
Posts: 55
Location: Trinidad, CO
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PostPosted: Sat Sep 20, 2014 11:26 am    Post subject: Reply with quote

Nevermind... i pulled a .3 switch from a spare engine and that did the trick.
I mean seriously... i drove the van for 5 mins without the wire plugged in and it fails??? WTF!

So don't look at your oil switches funny or they'll fail! Rolling Eyes
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?Waldo?
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PostPosted: Sat Sep 20, 2014 11:31 am    Post subject: Reply with quote

Actually the oil pressure switches are typically robust and running with the wire disconnected should not affect them. I think you just ran into an astronomically improbably coincidence.
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jslew
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Joined: March 03, 2008
Posts: 55
Location: Trinidad, CO
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PostPosted: Sat Sep 20, 2014 11:38 am    Post subject: Reply with quote

Andrew A. Libby wrote:
I think you just ran into an astronomically improbably coincidence.


That would pretty much sum up my luck! Murphy & me are very tight!
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'73 Baja
'74 Spec Ed Love Bug - my first car bought in '86!
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