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Alternator

Guest timswait

By Guest timswait
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Guest timswait

Guest timswait

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I bought a second hand but fairly new VW alternator (not for the Hood, a different project), but inadvertently got an ECU controlled one. It has 3 connections, battery, warning light and DFM (digital field monitor) which is meant to connect to the ECU. Unfortunately I don't have an ECU to connect it to, so does anyone know what it'll do if I leave this disconnected, will it still work?

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Steve Walker Builder

Steve Walker

Posted
Posted
I bought a second hand but fairly new VW alternator (not for the Hood, a different project), but inadvertently got an ECU controlled one. It has 3 connections, battery, warning light and DFM (digital field monitor) which is meant to connect to the ECU. Unfortunately I don't have an ECU to connect it to, so does anyone know what it'll do if I leave this disconnected, will it still work?

 

I know that the one on a Ford Focus has a three pin plug which allow the ECU to control alternator output at different voltages for rapid charging and then energy efficiency - apparently pulling the plug causes the alternator to switch to its maximum set voltage, charging fine, but wasting engine power. The VW one may do something similar.

 

SteveW

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