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Old 08-05-2005
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how to test relays

i want to see if these relays are working properly i have 2, how can i test them.
http://relays.tycoelectronics.com/datasheets/VF28.pdf
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Old 08-05-2005
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There are two types shown. You can tell if it's single pole, double throw (SPDT) or single pole, single throw (SPST) by the pin count.

~~~~~~~~~~~~~~~~~~~~~~~~~

SPDT (5-pin)

pin 30 to pin 87A: near zero resistance
pin 30 to pin 87: near infinite resistance.

Then apply 12v, + to pin 85 and - to pin 86:
pin 30 to pin 87A: near infinite resistance.
pin 30 to pin 87: near zero resistance

~~~~~~~~~~~~~~~~~~~~~~~~~

SPST (4-pin)

pin 30 to pin 87: near infinite resistance.

Then apply 12v, + to pin 85 and - to pin 86:
pin 30 to pin 87: near zero resistance
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Old 08-05-2005
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4 pins 85 30 87 86
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Old 08-05-2005
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Quote:
Originally Posted by Rob99
4 pins 85 30 87 86
SPST (4-pin)

pin 30 to pin 87: near infinite resistance.

Then apply 12v, + to pin 85 and - to pin 86:
pin 30 to pin 87: near zero resistance
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Old 08-06-2005
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If you're in doubt just swap the relay with a known good one. Take the relay you're in doubt of and make it your fog lamp or fuel pump relay and you'll know right away. That's all I ever do and still make money at work.
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Old 08-06-2005
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Quote:
Originally Posted by 67cobain94
If you're in doubt just swap the relay with a known good one. Take the relay you're in doubt of and make it your fog lamp or fuel pump relay and you'll know right away. That's all I ever do and still make money at work.
Good idea but these are not Ford relays.
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Old 08-06-2005
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well i don't know if im doing correctly as you explained, but using a multitester and contacting they way you say i get 00.5 or less no clicking sound coming from the relay. tester set to V DC with black lead to 'COM' and red lead to 'V'

Last edited by Rob99; 08-06-2005 at 01:04 PM.
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Old 08-06-2005
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There will not be a click sound of the relay switching if you are not applying 12 volts, and a mulitimeter does not apply 12 volts when set to dc volts...
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Old 08-06-2005
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Right. You will need to apply 12V DC from a power source such as a battery or a group of batteries. At the truck, I use clip leads from the truck's battery. When bench testing in the house, I use a simple battery holder from Radio Shack that holds eight 1.5V AA batteries. It looks something like this:

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Old 08-06-2005
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OK they are working correctly, thanks to all for the help

Last edited by Rob99; 08-06-2005 at 05:41 PM.
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