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Your GM car or truck
has a relay to turn the fuel pump on and off. The fuel pump pulls
gasoline out of the tank and sends it to the engine. If the relay fails,
the pump won't come on and the engine won't start. Since many things
other than a bad fuel pump relay can cause a car to not start, you need
to remove it to test it properly. Look for your GM relay in the fuse box
under the hood that contains fuses and circuit breakers.
Open the hood of your vehicle
and find the relay. If your fuse panel isn't labeled, look in your
owner's manual for the specific location. With the ignition off, pull
the relay out of the socket. You might need to wiggle it a little to get
it loose.
2
Look on the relay for the pin
designations. Most relays have a diagram printed on the cover. If not,
look in a service manual or wiring diagram for your GM vehicle. You need
to identify the two pins for the coil and the two pins that the relay
closes to turn on the fuel pump, usually marked "common" (C) and
"normally open" (NO).
3
Turn your multimeter dial to an
ohms scale and touch the tips of the probes together to test it. The
meter should read zero ohms.
4
Touch the probe tips to the pins
that connect to the relay coil. The meter should read between 50 and
120 ohms. If not, the relay coil is bad.
5
Touch the meter leads to the two
pins that should make contact when the relay operates. You should not
read anything at all on the meter, indicating that the terminals aren't
making a connection. If you read ohms, the relay contacts are stuck or
shorted.
6
Connect one end of each test
lead to each of the two pins connected to the relay coil. Connect the
other end of one of the test leads to the chassis ground and the other
to the battery positive terminal. The relay should operate and you
should hear a click.
7
Touch the meter probes again to
the two pins that should make contact. They should now read zero ohms,
indicating that the connections are making contact. If not, the relay is
bad.
hadder: in the engine compartment is a large box which contains fuses and relays. The starter relay is one of ones in the very rear(close to the firewall) It would be the second one in from the engine side and is a 5 pin relay. The same location applies for the four and V-6's.
Check fuse #6 20amp on your interior fuse panel it may be blown. The relays are located in an auxillary relay box located under the hood on the drivers side fender near the firewall. The system uses 2 relays. One relay turns on for left turn signal, other relay turns on for right signal. Both relays turn on for brake lamps. The fuse #6 is more likely the problem. If the fuse is blown, replace it, wiggle the wiring on the trailer while someone steps on brakes to check for shorts.
You have 2 fuse feeds in battery junction box under hood.Fuse 6(60amp) and fuse 62(30amp) and one fuse in the interior fuse panel no. 17(15amp).
How the system works is fuse 6 feeds fuse 62 which feeds the switch side of the accessory delay relay which is located in the interior fuse panel. Fuse 17 feeds the coil side of the relay and the instrument cluster micro-processor grounds the coil side of the relay.
When coil side of relay is grounded it creates a magnetic field which pulls the switch side closed which then lets power flow to the master window switch on the LB/BK wire on pin 6. The ground for the master switch is G400 which is the BK wire on pin 2 and G400 is located in the left rear quarter panel next to the tail lamp assembly.
Wiring relays and connections – all modelsRelays (typical)
1 Vacant 2 Intake manifold preheating relay (carburettor models) or fuel pump relay (injection models) 3 Seat belt warning system relay 4 Gearshift indicator control unit 5 Air conditioner relay 6 Dual tone horn relay 7 Relay for foglights and rear foglight 8 Relief relay for X contact 10 Intermittent wash/wipe relay 11 Rear window wiper relay 12 Turn signal flasher or trailer towing warning relay 13 Seat belt warning system (interlock) or rear window, driving lights and oil pressure warning relay 14 Window lift or seat belt warning system relay 15 Headlight washer relay 16 Control unit for idling speed increase 17 Fuse for rear foglight 18 Control unit for coolant shortage indicator 19 Thermo fuse for window lifters 20 Switch unit for heated driver’s seat 21 Switch unit for heated passenger’s seat 22 Switch unit for overrun cut-off 23 Vacant 24 Vacant Relays are symbolised as a number in a black box Not all relays are fitted to all models Connections A Multi-pin connector (blue) for dash panel loom B Multi-pin connector (red) for dash panel loom C Multi-pin connector (yellow) for engine compartment loom left D Multi-pin connector (white) for engine compartment loom right E Multi-pin connector (black) for rear wiring loom G Single connector H Multi-pin connector (brown) for air conditioner or wiring loom K Multi-pin connector (transparent) for seat belt warning system loom L Multi-pin connector (black) for lighting switch terminal 56 and dip and flasher switch terminal 56b (carburettor models) or multi-pin connector (grey) for dual tone horn (injection models) M Multi-pin connector (black) for lighting switch terminal 56 and dip and flasher switch terminal 56b (injection models) N Single connector for separate fuse (manifold heater element) P Single connector (terminal 30) R Not in use Fuse colours Blue 5A Green 30A Red 10A Yellow 20A
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