Pontiac FIREBIRD 1972 Service Manual page 1298

12-28 1972 PONTIAC SERVICE MANUAL
3. If voltage is 9.6 or more, energizer is good and suffi-
ciently charged to return to service.
4. If voltage is less than 9.6, replace energizer.
CHARGING INSTRUCTIONS
1. Charge at maximum setting of charger for the length
of time required to obtain 50 ampere-hours of charge.
Examples:
INITIAL CHARGE RATE HRS. TO CHARGE*
75 Amps. 2/3
50 Amps. 1
25 Amps. 2
10 Amps. 5
WIRING HARNESS
Engine, passenger compartment and rear end wire harness
routings and connections are shown in Fig. 12-1 14 (B
Series), Fig. 12- 1 15 (A Series), Fig. 12- 1 16 (G Series), Fig.
12- 1 17 ( F Series) and Fig. 12- 1 18 (X Series) at end of
section. The wiring harness routing is positioned to reduce
possibility of damage to harness.
In addition the body harness is protected with a tough
plastic conduit to prevent puncture and shorting. Particu-
lar attention should be given toward making sure wiring
is not pinched, stretched or positioned so as to contact any
movable parts under instrument panel. This includes hand
brake, foot brake, ash trays, accelerator linkage, etc. All
unfused circuits and the engine wiring harness have a
.067" nylon jacket to improve resistance to heat, pinching
and cutting.
*
Initial charge rate is the current that the energizer
will accept at the start of charging. As the energizer
is charged, this rate will decrease.
When a charger does not have an ammeter, place a
test ammeter in series with the charger to determine
the initial charge rate.
If energizer temperature is 32°F or less, energizer
should be charged for 1/2 hour at charger's highest
setting before the charge rate is determined.
2. Do not exceed the calculated hours of charge, as
overheating and spewing of acid might result. In case
of spewing, shut off charger and proceed with testing.
FUSE BLOCK
The fuse block (Figs. 12-32 and 33) is located on the dash
shroud at left side just above front edge of floor mat, and
has'replaceable fuse clips which are serviced separately.
An efficient tool for fuse clip removal can be made from
a cotter pin approximately 2-1/2" long. Cut off long leg
even with short leg. File bevel on outside of both legs.
Spread pin wide enough to span fuse clip.
The front end and engine harnesses are firmly attached to
the bulkhead connector which is connected to the front of
the fuse block by two bolts. This makes for easy disconnec-
tion allowing quick diagnosis of electrical problems. A
circuit passing through a given terminal may be identified
by using the embossed letters on the bulkhead connector.
BATTERY CABLE
FUSIBLE LINK
REPLACE
When replacing battery ground cable, be sure the connec-
tions are clean and secure. Apply petroleum jelly or pe-
trolatum to cable clamps and terminals to retard
corrosion. On the heavy duty side
-
terminal battery,
torque the terminal bolts to 60-90 lb. in.
BATTERY SUPPORT
REPLACE
When replacing the battery on B and F Series, first posi-
tion the battery into the fixed tray. Then, position the
retainer clamp on the battery top and onto the hold-down
bolt. Torque the hold-down nut to 38-42 lb. in. On A, G
and X Series, position the retainer clamp into the battery
hold-down slot and torque the hold-down screw to 60-90
lb. in.
Added protection is provided in all battery feed circuits by
a fusible link (Fig. 12-34). This link is a short piece of
copper wire approximately 4" long inserted in series with
the circuit and acts as a fuse. The link is four gauges
smaller in size than the circuit wire it is protecting and will
burn out without damage to the circuit in case of current
overload.
The X Series incorporates the following fusible links:
1. The pigtail lead at the battery positive cable is a 14
gauge, brown fusible link protecting the 10 gauge
battery charging circuit. This wire is an integral part
of the battery cable assembly and servicing requires
replacing the complete battery cable assembly.
2. A 16 gauge black fusible link is located at horn relay
to protect all unfused wiring of 12 gauge or larger. It
is a serviceable piece with an in-line connector and is
not integral with the wiring harness.