Section 9 --- Electrical Systems - Chassis
The Executive 2005
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Another indicator to the type of relay is the post or legs. Turn the relay over and look at the post.
Note the differences between the numbered posts:
1. The 30 post is the incoming fuse and/or breaker power. Some relay applications supply
power to the 30 post. Some use it for ground. The 30 post can be used many different
ways.
2. The 85 post is one side of the coil, tripped different ways.
3. The 86 post is the opposite side of the coil, tripped different ways.
4. The 87 posts are not common to the 30 post until the relay is tripped. When the relay trips,
both 87 posts are common to the 30 post.
5. Using an 87a relay, the 30 post and the 87a post are common. When the coil is tripped, the
87a post becomes inactive and the 30 post becomes common to the 87 post located on the
outside of the relay.
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