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od switch & relay questions 84 240 (autotranny) 200

posted by Axel on Fri Jun 18 11:13 CST 2004
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last visit: Mon Mar 12 06:12 CST 2007

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Well the relay is flaky. tap it and it works.

1) The switch on the shifter. Is it a momentary switch or should it have
an on and off function?
My switch closes when depressed but opens as soon as I release pressure.

2) To lock the OD on can I just jumper relay terminals 87 & 15?

thanks!

--
home page - http://www.geocities.com/vw_bus_74/index.html

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od switch & relay questions 84 240 (autotranny) 200

posted by Don Foster on Fri Jun 18 12:51 CST 2004
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last visit: Sun Oct 5 11:53 CST 2014

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The pushbutton switch is a momentary contact type. The performance you described is correct.

The OD relay is notorious for bad (cracked) solder connections, which results in the symptoms you described. Resolder the circuit board in the relay assembly. $0, 15 minutes, no risk, clean 'n easy work. If it solves nothing, you're out nothing.

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Don Foster (near Cape Cod, MA)

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od switch & relay questions 84 240 (autotranny) 200

posted by Axel on Sat Jun 19 02:53 CST 2004
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last visit: Mon Mar 12 06:12 CST 2007

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""Resolder the circuit board in the relay assembly. $0, 15 minutes, no risk, clean 'n easy work. If it solves nothing, you're out nothing.""

---Good suggestion! I didnt even think of popping the cover on it.
And your right! No cost so it's worth a shot. The relay doesnt have the
schematic printed on it so I couldnt determine it's function. So the switch
is just a trigger voltage not the on/off coil voltage.

Thanks for the reply.
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home page - http://www.geocities.com/vw_bus_74/index.html

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od switch & relay questions 84 240 (autotranny) 200

posted by Don Foster on Sat Jun 19 03:05 CST 2004
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last visit: Sun Oct 5 11:53 CST 2014

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"So the switch is just a trigger voltage not the on/off coil voltage."

Right! It triggers a bi-stable circuit in the OD relay assy. The bi-stable circuit drives the actual relay.

Got pictures if you want.....

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Don Foster (near Cape Cod, MA)

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od switch & relay questions 84 240 (autotranny) 200

posted by Axel on Sat Jun 19 08:28 CST 2004
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last visit: Mon Mar 12 06:12 CST 2007

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Thanks the "trigger pulse" to my brain Don.. I dont use relays with a trigger
input often as most of the ckts. I put together are for event detection i.e.
failsafe ckts so I use alot of time delay relays with a voltage trigger derived
from a controller system.. at any rate.. I touched up the solder on the
board and it works as designed now. :-) saved 50 bucks.. thanks!
--
home page - http://www.geocities.com/vw_bus_74/index.html

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