Mercury 305 CID, Service Manual, Page: 389 / 967

4E-8 - ELECTRICAL KITS 90-823225--1 1096
Audio Warning System
! WARNING
Always disconnect battery cables from battery
before working around electrical system compo-
nents to prevent injury to yourself and damage to
electrical system.
86047A14 Kit
INSTALLATION INFORMATION
Audio Warning Heat Switch on V-8 Engines
with Standard Cooling
1. Drain cooling system.
2. Disconnect port hoses from thermostat housing.
3. Remove TAN/BLUE wire from water heat switch
in port side of thermostat housing. Remove
switch.
NOTE: Hoses shown removed for clarity.
72613
b
a
a - Audio Warning Heat Switch
b - TAN / BLUE Wire
4. Install audio warning heat switch as follows:
a. Install heat switch into aft side of thermostat
housing, using Loctite Pipe Sealant with Te-
flon (DO NOT use Teflon tape) to seal
threads. Tighten securely.
b. Attach TAN/BLUE wire to heat switch with nut
and lockwasher. Tighten nut securely.
c. Coat connections with Quicksilver Liquid
Neoprene.
5. Reconnect water hoses.
Audio Warning Heat Switch on V-8 Engines
with Closed Cooling
1. Drain cooling system.
2. Remove TAN/BLUE wire from audio warning
heat switch in rear hole of thermostat housing.
Remove switch.
71518
b
a
a - Audio Warning Heat Switch
b - TAN / BLUE Wire
3. Install audio warning heat switch as follows:
a. Install heat switch into thermostat housing,
using Loctite Pipe Sealant with Teflon (DO
NOT use Teflon tape) to seal threads. Tighten
securely.
b. Attach TAN/BLUE wire to heat switch with nut
and lockwasher. Tighten nut securely.
c. Coat connections with Quicksilver Liquid
Neoprene.
4. Fill closed cooling system with proper water/anti-
freeze solution. (Refer to “Filling Closed Cooling
Section” in Section 6B.)