[DML] Relay Contacts
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[DML] Relay Contacts





Group, 
I was ask off line about a RPM relay problem and how it would effect 
the fuel pump operation. Relay contacts get burn't as they open and 
close and set up a resistance so voltage and current don't pass very 
well. Thus we have a limited operation.  
In an emergency or to buy a little time If you can pop the top off
any 
relay and get to the contacts take about a 2" to 3" x 3/16" wide
piece 
of 180 or better emery cloth sand paper and fold it over, put it 
between the contacts and swipe it back and fourth 2 or 3 times. This 
is what is called Burnishing the contacts. Don't keep on doing it 
because more doesn't get better. Don't over do it or you will cut off 
all the contact surface if it isn't already gone. The surface of a 
contact is normally silver plated for better conductivity.
All your doing is resurfacing the contact area to get rid of the
burnt 
crusty material that is stopping the contacts from touching good and 
solid so you can get on down the road. Repalace the relay as soon as 
you can and keep the old one and tool as a spare. 
By the way, If you realy get in a pinch, the smooth side of a 
fingernail file will work if you have one of them with you. Peal the 
smooth side off so the material won't be so thick.(:-)).
John Hervey
  








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