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Old 09-11-2009, 05:55 PM
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Bosch Relay Contacts

I have wired my torque converter lockup using a relay to pass the 12v current to the lockup solenoid. Converter worked before going to the relay circuit.

Now the converter never locks up. Does it make any difference whether you interchange coil contacts 86 and 85. Most diagrams show power coming to contact 86 and 85 used as a ground.

I reversed these and hooked power to 85 and grounded 86. Would this prevent the coil from activating?

John

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Old 09-11-2009, 06:24 PM
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Not sure about your particular relay, but some have a diode connected across the coil to eliminate the inductive "kick" that the coil can produce at the moment it is de-energized. If that is the case with yours, then proper polarity is critical. If it is connected such that the diode conducts when the coil is energized, then you have essentially a short across the relay coil that would prevent the relay from energizing. I'm guessing that if you reverse the coil connections, your problem will be corrected, if you didn't fry the diode. Usually when a diode fails, they short out. If that happened, replace the relay.
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Old 09-11-2009, 08:27 PM
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I am using a relay because I have incorporated a RPM switch into the control circuit so that lockup only occurs above a specified engine RPM.

I tested the RPM switch and it doesn't seem to be completing its circuit no matter how high I rev the engine. That must be my problem.

I have a second relay from same manufacturer and I checked it by applying voltage both ways across the 85 and 86 contacts and it provides continuity between 30 and 87 either way. Have not pulled the relay I used from under the dash to check it yet, the RPM switch appears to be the problem.

John
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Old 09-12-2009, 07:22 AM
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Here are a few wiring diagrams.
With tow application

Without tow application

Vince

Last edited by 302 Z28; 09-12-2009 at 07:27 AM.
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Old 09-28-2009, 08:29 PM
ema ema is offline
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Thank you for posting these infos here. I had a problem on understanding some stuffs with this bosch relay . Good thing I realized it here.
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Old 09-29-2009, 06:47 AM
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Update -- the problem was a bad crimp connection between the RPM switch and the relay. TC lockup works nicely now.

John
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Old 09-29-2009, 07:57 AM
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Glad you got it fixed.

Vince
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