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Join Date: Dec 2005
Location: florida
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Question RED vs BLACK relays

ANY DIFFERENCE BESIDES COLOR IN ROUND 5 PIN
RELAYS IN FRONT FUSE BOX--THEY SEEM TO BE
INTERCHANGEABLE

77 TARGA

Old 11-12-2006, 03:05 PM
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The reds have a diode in them which does not permit reverse current flow. Can't remember if it's on the control circuit of the power circuit though...

ianc
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Old 11-12-2006, 03:07 PM
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The red relays have a noise suppression diode across the coil to minimize noise spikes on the power bus that would normally happen when the relay releases. Terminal #85 MUST be grounded -- not the + 12 Volt power signal, which is Porsche policy for all standard black relays, so ... thankfully, there isn't a fire hazard when a red relay is substituted in a socket for a black relay!
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Old 11-12-2006, 05:03 PM
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The red relays have the diode which is called a "flyback" diode. It surves to prevent the inductive kick from a coil getting back into the 12VDC system.

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Old 11-12-2006, 05:21 PM
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