Stereo Cassette - Ignition Noise/Alternator Whine
Article No. 86-24-26RADIO - STEREO CASSETTE - IGNITION NOISE/ALTERNATOR WHINE AT MINIMUM VOLUME
LIGHT TRUCK 1983-86 F-SERIES, BRONCO
Figure 18:
Figure 19:
Figure 20:
Figure 21:
Figure 22:
Figure 23:
Figure 24:
RPM related ignition noise/alternator whine heard with the radio's volume control set at minimum sound can be corrected by cutting, taping back and rerouting the #37 (yellow wire) circuit (part of the 14401 main wiring assembly). The wire should be rerouted from entering the interior of the vehicle through the passenger's side of the dash panel, across the dash panel and connected to either the junction block or the auxiliary battery relay (if so equipped) located on the driver's side of the dash panel. If the unit isn't equipped with either a battery relay or a junction block, the feed wire should be connected to the existing (unused) take-out (yellow wire/blue one-way connector) in the 14401 wiring assembly entering the engine compartment through the driver's side of the dash panel. Refer to Figures 18 through 24.
PROCEDURE FOR REROUTING THE #37 BATTERY TO ACCESSORY FEED (YELLOW WIRE) CIRCUIT
General Instructions
Figure 18:
Figure 19:
1. Disconnect the battery ground cable.
2. Locate the 14401 wire harness which runs from the starter relay along the fender apron and through the dash panel into the passenger compartment. Refer to Figures 18 (1986 units) and 19 (1983-85 units).
Figure 18:
Figure 20:
1986 Units (With Fuse Links):
1. Refer to Figures 18 and 20 (View A) and locate the two fuse links in the 14401 wiring assembly near the starter relay (one is 14 gauge green, the other is 16 gauge orange).
NOTE: The 14 gauge green fuse link is the #37 circuit wire.
Figure 20:
2. Cut the green wire two inches past (toward the dash panel) the fuse links to terminate the feed circuit at this point. Fold back the cut end of the wire which goes inside the vehicle and tape wrap with (D6AZ-19627-A) pressure-sensitive waterproof tape, Figure 20.
3. Tape wrap the entire area to prevent unraveling.
4. At the remaining cut end of the Green wire, which connects to the starter relay, strip away 3/8 inch of insulation followed by installing a butt splice connector (E6FZ-14488-C), using a standard crimp tool and a heat gun, Figure 20.
5. Strip away 3/8 inch of insulation from one end of the roll of 10 gauge (Black) wire and install into the other end of the butt splice connector and crimp in place, Figure 20, View A.
Figure 21:
6. Route the 10 gauge wire along the dash panel over to the 14401 main wiring assembly entering the engine compartment through the driver's side of the dash panel, as shown in Figure 21. Secure the rerouted wire to the dash panel and surrounding hardware, wiring and vacuum hoses, as required, using adjustable binding straps (95874-S).
Figure 22:
7. At the driver's side of the vehicle, locate either of these items:
a. Junction block mounted on the dash panel, Figure 22.
Figure 23:
b. Auxiliary battery relay mounted on the dash panel, Figure 23.
Figure 24:
c. One-way hardshell wiring connector, Figure 24.
Figure 22:
Figure 23:
8. At this point, join the rerouted feed circuit to one of the above items as shown in the appropriate illustration.
NOTE: To complete the connection at EITHER the junction block OR the auxiliary battery relay, install a (B9A-14294-H) Yellow eyelet on the remaining end of the (new) rerouted 10 gauge wire and attach the wire to the junction block, as shown in Figure 22, or to the left side of the relay, as shown in Figure 23.
Figure 24:
NOTE: To complete the connection when NEITHER a junction block NOR an auxiliary battery relay is present, assemble a Blue (D6TZ-14489-A) hardshell wiring connector and a (D20Z-14474-B) wire terminal and install onto the remaining end of the (new) rerouted 10 gauge wire and connector the wire and connector assembly to the existing (previously unused Blue) take-out (pan of the #37 (Yellow) circuit), as shown in Figure 24.
9. Reconnect the battery and verify the condition has been corrected.
1983-85 Units (Without Fuse Links):
1. Repeat Steps 1 and 2 under "General Instructions".
Figure 20:
2. Moving toward the front of the vehicle, approximately 17 inches from the existing dash panel grommet, carefully cut away about 3 inches of wiring wrap to expose the Yellow 10 gauge wire (#37 circuit). Cut the Yellow 10 gauge (#37 circuit) wire at this point to terminate the feed circuit. Fold back the cut end of the wire which goes inside the vehicle and tape wrap with pressure-sensitive waterproof tape (D6AZ-19627-A), as shown in Figure 20, View B.
3. Repeat Steps 3 through 9 of the procedure for 1986 model units.
PART NUMBER PART NAME CLASS
WB-310-B 10 Gauge Wire (Black) C
E6FZ-14488-C Butt Splice Connector B
(Yellow)
B9A-14294-H Straight Eyelet (Yellow) R
D6TZ-14489-A One-Way Hardshell C
Connector
D20Z-14474-B Wire Terminal C
95874-S Strap - Adjustable, AG
Binding
D6AZ-19627-A Pressure-Sensitive BG
Electrical Tape
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP14401E86
TIME: 0.6 Hr. DLR. CODING: Basic Part No. 14401 - Code: 43