Relays for volvo penta 854 357

The VP relays are nothing special except they're sealed. I found it impossible to source sealed relays in the right spec. Note that the right spec is 5 pin changeover, type B configuration, diode protected. The diode cathode should be connected to pin 86 (some relays have a diode the other way round). There are those who say the diode is not necessary or a resistor can be used instead. This may be true, but I wouldn't want to take a chance.

I used these: Mini Changeover Relay 12V 30/40A - With Diode | 12 Volt Planet They seem to be good quality and the 'skirt' around the base is easy to seal with a smear of sealant or vaseline. However, I wouldn't bother with vaseline on the terminals. Use 'Corrosion Block' instead. It's made for the job.

BTW, I strongly suspect a lot of relays are needlessly changed. People have symptoms of relays failing and change them. If the problem goes away, they're persuaded it must have been a faulty relay. I suggest that the act of changing the relay has simply cleaned the connections - they're far more prone to corrosion that relays are to failing. If you change the relays, give the connectors a good clean and spray with corrosion block. If they're really manky, change them. Again, 12 volt planet has the necessary bits to do this.
 
BTW, I strongly suspect a lot of relays are needlessly changed. People have symptoms of relays failing and change them. If the problem goes away, they're persuaded it must have been a faulty relay. I suggest that the act of changing the relay has simply cleaned the connections - they're far more prone to corrosion that relays are to failing. If you change the relays, give the connectors a good clean and spray with corrosion block. If they're really manky, change them. Again, 12 volt planet has the necessary bits to do this.
I agree. Instead of a bit of emery paper I use these glass fibre pens to clean terminals...

Modelcraft 4 mm Glass Fibre Pencil: Amazon.co.uk: Kitchen & Home

Pete
 
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