Re: [DML] Re: Headlight switch repairs

[Paul Gress <pgress@xxxxxxxxxxxxx>]

David Teitelbaum wrote:
> As important as the type of relay is the rating. Higher is better as far as current and voltage go. Another "trick" is to take a DPST relay and wire both sides together in parallel so each contact only has to carry 1/2 the load. 


I have to half agree with this point.  The initial current carrying 
capability is only for one set of contacts.  For electrical purposes, 
both sets contacts will never meet at the same time, so one contact will 
always arc first and take the brunt of current or wear and tear.  After 
the initial closing of both sets of contacts will the current carrying 
capability be doubled.



> For inductive loads, like the coils which are used in the door lock circuit, putting a capacitor across the contacts will reduce the arcing and prolong the life of the contacts. 


I guess if someone really wanted to suppress arcing on the contacts you 
would use a transistor or solidstate relay to do the initial switching 
"on" then use the relay to take over after that.


> Diodes won't do that.


Diodes will only suppress the kick back voltage generated by the coil.


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