Relay Tests - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
360
VARIABLE
RESISTOR
Figure 11-15. Relay Tests
11-23. RELAY(DELCO-REMY)
11-24. CHECKING RELAY. The relay is a protective device against high volt-
age that may appear in the electrical system. The relay will open the circuit to
the alternator field winding if the system voltage should ever reach a predeter-
mined value. When the circuit opens, the alternator
voltage will be eliminated.
The relay is designed
so that the battery will continue to hold the relay contacts
open until the engine is stopped or the master switch is opened.
The No. 1 ter-
minal on the relay is connected to the master switch, and the No. 2 terminal
to
the regulator "POS" terminal. For connections,
refer to the airplane wiring
diagram.
With the relay removed from the airplane, an electrical check can be made
on a test bench to determine if the relay is operating properly.
CAUTION
Do not remove the cover or attempt to make adjust-
ments on this relay. If the assembly
does not pass
the following electrical check, discard
the relay. If
the relay does pass the following electrical
check, it
may be re-used.
Reissued: 10/12/79
Effectivity
DELCO
ELECTRICAL SYSTEM
4B13