Ground Controls; Control Relays - Genie S-80 Service Manual

Section 4 • Repair Procedures

Ground Controls

6-1

Control Relays

Relays used for single function switching are single
pole double throw (SPDT) relays.
How to Test a Single Pole Double
Throw Relay
Electrocution/burn hazard. Contact
with electrically charged circuits
could result in death or serious
injury. Remove all rings, watches
and other jewelry.
1 Tag and disconnect all the wiring from the relay
to be tested.
2 Connect the leads from an ohmmeter or
continuity tester to each terminal combination
and check for continuity. Terminals 85 and 86
represent the coil and should not be tested in
any other combination.
Test
terminal 85 to 86 with resistor
terminal 87 to 87a and 30
terminal 87a to 30
3 Connect 12V DC to terminal 85 and a ground
wire to terminal 86, then test the following
terminal combinations.
Test
terminal 87 to 87a and 30
terminal 87 to 30
4 - 38
Desired result
75 to 85
no continuity
(infinite 
continuity
(zero )
Desired result
no continuity
(infinite 
continuity
(zero )
S-80 • S-85 • S-80X
terminal no. 87a - N.C.
terminal no. 85 - coil negative (-)
terminal no. 30 - common
terminal no. 86 - coil positive (+)
terminal no. 87 - N.O.
Control Relay Schematic
February 2012
Part No. 122985