Monaco SIGNATURE 2001 series, Owner'S Manual

Page: 228 / 327

The coach uses different relays to operate different equipment. If a relay
needs to be replaced, carefully record the location of each wire and its color.
The Bosch relays may look the same, but they are completely different.
Look at the side of the relay to determine whether you need an 87 relay or an
87a
relay. These relays can be easily mixed, and your problem may increase
if you change the wrong one. These two relays can be wired many different
ways to operate different functions. Turn the relay over and look at the post.
Each post is numbered. It is important to note these differences listed:
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 dif-
ferent 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 differ-
ent 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 com-
mon. When the coil is tripped, the 87a becomes a dead
post and then the 30 post becomes common to the 87 post
located on the outside of the relay.
Electrical Systems - Chassis
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
S I G N A T U R E 9 • 2 2 8
30
30
85
87
87
86
30
85
87a
86
87
Bosch Relay.
87-87 Relay.
87a Relay.