 Transmission reverse switch, works intermittently |
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| mtndawg |
 Jul 14 2020, 11:34 AM
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#1
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Member  Group: Members Posts: 414 Joined: 26-January 09 From: Granite Bay, Ca Member No.: 9,985 Region Association: None 
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My reverse lights work intermittently. Sometimes they will switch on at the same time as putting the shifter into reverse (as expected), sometimes there's a pause before they switch on and most of the time they don't come on at all. Seems like it would not be a problem with the pin, but could be a problem in the mechanism that threads into the transmission where the bullet connectors are inserted?...
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| framos914 |
Jul 14 2020, 08:02 PM
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#2
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Member Group: Members Posts: 125 Joined: 15-May 14 From: Corona California Member No.: 17,353 Region Association: Southern California
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Try testing the switch with an Ohm meter, make sure it transitions from open to close all the time. You could remove it from transmission and manually activate it to test.
On my 74 this switch provides the voltage to the reverse lights. |
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| Robarabian |
Jul 14 2020, 08:30 PM
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#3
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914 A Roo Group: Members Posts: 592 Joined: 11-February 19 From: Simi Valley, Kalifornia Member No.: 22,865 Region Association: Southern California
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After watching the Dr. Evil 901 rebuild video, he explains why.
There is a small detent that engages the switch to complete the circuit. That detent wears over time and when it is worn, it does not make good contact. According to the video, you can replace them. |
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| 914Sixer |
Jul 15 2020, 02:43 PM
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#4
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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URO makes replacement pins for about $7 depending on where you buy. Quick and easy. Unplug boot, bullets and unscrew switch. NOTE how pin comes out. There is a ring grove on it. Compare old to new.
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| UROpartsman |
Jul 17 2020, 09:25 AM
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#5
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Member Group: Members Posts: 291 Joined: 22-October 15 From: Simi Valley, CA Member No.: 19,288 Region Association: None
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Thanks Mark, it's URO Parts Activating Pin 901 303 017 02 (90130301702) for use with Switch 914 613 541 02.
AA and Sierra Madre have them for less than $4: http://www.autoatlanta.com/Porsche-Activat...0130301702.html https://sierramadrecollection.com/Tappet-91...-76-p23683.html Attached image(s) 
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| mtndawg |
Jul 17 2020, 12:08 PM
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#6
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Member Group: Members Posts: 414 Joined: 26-January 09 From: Granite Bay, Ca Member No.: 9,985 Region Association: None
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Thanks, thinking it's a worn switch rather than the pin because it works some of the time. Order from Pelican has been placed for a URO switch. Will give feedback once it's installed.
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