Ground Controls; Control Relays - Genie Z-45/25 Service Manual

Section 7 • Repair Procedures

Ground Controls

10-1

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 hazard. Contact with
electrically charged circuits could
result in death or serious injury.
Remove all rings, watches and
other jewelry.
1 Label and then 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
terminal 87 to 87a & 30
terminal 87a to 30
7 - 48
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 & 30
terminal 87 to 30
Desired result
75 to 85Ω
Control Relay Schematic
no continuity
(infinite Ω)
continuity
(zero Ω)
Genie Z-45/25 & Genie Z-45/25J
First Edition • Second Printing
Desired result
no continuity
(infinite Ω)
continuity
terminal no. 87a - N.C.
terminal no. 85 - ground
terminal no. 30 - common
terminal no. 86 - coil
terminal no. 87 - N.O.
Part No. 52709
(zero Ω)