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Old 11-17-2019, 05:44 PM   #1
Sp00fy
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Member#: 434282
Join Date: Nov 2015
Location: Torrance
Vehicle:
2006 WRX TR
Alpine White

Default 2005 STI - Main Relay Test (Blown or not)

Can anyone help to see if my main fuse is damaged or not. I connected it to alligator clips to 12 volts to see if it does have power and it clicks, and the 4 other prongs with a multimeter, is there some type of resistance to see if it’s bad?
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Old 11-17-2019, 08:09 PM   #2
Cougar4
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The closed contacts of the relay should have less than 1 ohm of resistance across the two contacts. Both sets of contacts should be that way. A relay is just an electric switch.
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Old 11-19-2019, 02:12 AM   #3
Sp00fy
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Quote:
Originally Posted by Cougar4 View Post
The closed contacts of the relay should have less than 1 ohm of resistance across the two contacts. Both sets of contacts should be that way. A relay is just an electric switch.


Tested and it works good thank you.
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Old 11-19-2019, 01:20 PM   #4
Cougar4
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You're welcome for the help. You can also test the contacts while power is connected to the load. When the relay contacts are closed and current is flowing to the load there should be close to zero volts across the relay contact connections. Any voltage across the contacts means there is some resistance there and it is causing a voltage drop to occur. There will be some voltage across the contacts, depending on the load current and how much contact resistance there is. Normally there should be less than .5 volts across the closed contacts.
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