Pontiac TRANS AM 1977 Service Manual page 1385

9-32 1977 PONTlAC SERVICE M A N U A L
PROCEDURE NO.
5
ALTERNATOR WHINE
1. CONNECT A 5 M F D TEST CAPACITOR
T O B A T T E R Y TERMINAL OF
ALTERNATOR (FIGURE
dl.
2. REMOVE ANTENNA
LEAD-IN FROM
RADIO.
3. FOR
COMBINATION RADIOITAPE
PLAYERS. INSERT A TAPE UPSIDE
DOWN TO TURN THE SET ON WITHOUT
SOUND.
4.
LISTEN FOR A WHINE WHICH
INCREASES AND DECREASES WITH
ENGINE RPM.
5. I F WHINE PERSISTS, ADD A SMFD
CAPACITOR TO BATTERY TERMINAL
(SEE FIGURE el.
BATTERY
CYY'TGl
IUI
I
6. I F WHINE PERSISTS, FOLLOW
PROCEDURE NUMBER 6.
PROCEDURE NO.
6
CONNECTING FILTER
PACKAGE TO RADIO
POWER LINE
1. DISCONNECT RADIO FEED WIRES
FROM BACK OF RADIO.
2.
CONNECT FILTER PACKAGE (PIN
12234801 TO A RADIO (FIGUREfl.
CONNECT THE GROUND LEAD TO A
RADIO CASE SCREW.
3. CONNECT RADIO FEED WIRES TO
OTHER END OF FILTER PACKAGE.
PROCEDURE NO.
7
SCREENING THE DASH
1 CLT ObT A 36 INCH BY 12 INCH PIECE
OF SCREEN. ATTACH A CLlP LEAD TO
EACH END OF THE SCREEN.
2.
MAKE SURE THE ANTENNA IS
PLUGGED IN. START THE ENGINE.
AND TURN ON THE RADIO.
3. L A Y THE PIECE OF SCREEN ON TOP OF
THE DASH (FIGURE 91. ATTACH THE
CLlP LEADS FROM THE SCREEN TO
THE CAR CHASSIS [BARE METAL) TO
ACHIEVE A GOOD GROUND.
4. IF THE NOISE REDUCES OR
DISAPPEARS. THE CAUSE IS UNDER
THE DASH. THE SCREEN ACTS AS A
SHIELDTO REMOVE NOISE.
PROCEDURE NO.
8
BLOWER MOTOR
1. INSTALL COAX CAPACITOR AS SHOWN
IN FIGURE h .
4063
Fig.
9-37
Radio
Noise
Suppression