Intermitant Power Failure
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Three Wheeling
Joined: May 2010
Posts: 59
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From: Salina, Kansas
Intermitant Power Failure
Here's a fun one:
About three weeks ago, my 2001 Disco II (103000 miles) started showing no power to A/C or garage door opener after starting. I would turn it off and turn it back on then everything was fine. I have since discovered that I don't need to turn it off, just rotate the key back a little and it all works.
Now, going over some bumps seems to shut down the entire electrical system. Minor bumps turn off the radio. The car starts back up within 2 seconds or so without needing to stop or move the key. However, the power outages are becoming more frequent.
Any suggestions?
About three weeks ago, my 2001 Disco II (103000 miles) started showing no power to A/C or garage door opener after starting. I would turn it off and turn it back on then everything was fine. I have since discovered that I don't need to turn it off, just rotate the key back a little and it all works.
Now, going over some bumps seems to shut down the entire electrical system. Minor bumps turn off the radio. The car starts back up within 2 seconds or so without needing to stop or move the key. However, the power outages are becoming more frequent.
Any suggestions?
Super Moderator
Joined: Jan 2011
Posts: 16,322
Likes: 88
From: Savannah Georgia
Main fuse block under hood? Loose connections, etc.? In the RAVE tech manual it covers a number of spots that might need to be tightened up:
OPERATION
Starting and Charging Supply
Circuit supply
A feed from the battery positive terminal is connected on an R wire to the engine
compartment fusebox where it passes through fusible links 1, 8 and 12 and fuses 10 and 13.
A feed from the battery is connected directly to the contacts of the main relay located in the
engine compartment fusebox.
A second feed from the battery positive terminal is connected on an R wire to the contacts
of the starter motor solenoid, located on the starter motor.
A feed from fusible link 1 is connected from the fusebox on an N wire to the alternator/
generator.
A feed from fusible link 8 is connected on an NW wire to the passenger compartment
fusebox and from the fusebox to the ignition switch on an N wire.
A feed from fuse 10 is connected to the contacts of the fuel pump relay located in the engine
compartment fusebox. The Engine Control Module (ECM) provides an earth path for the fuel
pump relay coil, which energises and closes the relay contacts.
A feed from fuse 13 is connected from the fusebox to the inertia switch on an NB wire. When
the inertia switch contacts are closed, the feed passes through the switch and is connected
to the coil of the main relay on a WG wire. An earth connection from the main relay coil is
connected on a UR wire to the ECM. When the ECM completes the earth path, the coil
energises and closes the main relay contacts.
compartment fusebox where it passes through fusible links 1, 8 and 12 and fuses 10 and 13.
A feed from the battery is connected directly to the contacts of the main relay located in the
engine compartment fusebox.
A second feed from the battery positive terminal is connected on an R wire to the contacts
of the starter motor solenoid, located on the starter motor.
A feed from fusible link 1 is connected from the fusebox on an N wire to the alternator/
generator.
A feed from fusible link 8 is connected on an NW wire to the passenger compartment
fusebox and from the fusebox to the ignition switch on an N wire.
A feed from fuse 10 is connected to the contacts of the fuel pump relay located in the engine
compartment fusebox. The Engine Control Module (ECM) provides an earth path for the fuel
pump relay coil, which energises and closes the relay contacts.
A feed from fuse 13 is connected from the fusebox to the inertia switch on an NB wire. When
the inertia switch contacts are closed, the feed passes through the switch and is connected
to the coil of the main relay on a WG wire. An earth connection from the main relay coil is
connected on a UR wire to the ECM. When the ECM completes the earth path, the coil
energises and closes the main relay contacts.
DESCRIPTION AND OPERATION
DISCOVERY SERIES II
4.45
Ignition switch supply
With the ignition switch in position II, the feed from fusible link 8 passes through the ignition
switch to the passenger compartment fusebox on a Y wire, where it passes through fuse 27
in the fusebox.
With the ignition switch in the crank position III, the feed from fusible link 8 passes through
the ignition switch to the passenger compartment fusebox on a WR wire, where it passes
through fuse 23 in the fusebox.
switch to the passenger compartment fusebox on a Y wire, where it passes through fuse 27
in the fusebox.
With the ignition switch in the crank position III, the feed from fusible link 8 passes through
the ignition switch to the passenger compartment fusebox on a WR wire, where it passes
through fuse 23 in the fusebox.
Starting Operation
Main relay operation
With the ignition switch in position II and the ECM is satisfied that all conditions are correct,
the ECM grants an earth path on a UR wire from the engine compartment fusebox to the
ECM pin C0635-23, energising the relay coil and closing the contacts.
the ECM grants an earth path on a UR wire from the engine compartment fusebox to the
ECM pin C0635-23, energising the relay coil and closing the contacts.
Fuel pump relay operation
When the main relay contacts are closed, the feed direct from the battery passes through
the relay contacts and is connected to the coil of the fuel pump relay. An earth path from the
fuel pump coil is connected to the ECM pin C0635-18 on a UP wire. When the ECM
completes the earth path, the coil energises and closes the fuel pump relay contacts.
The feed from fuse 10 passes through the contacts of the fuel pump relay and is connected
on a WP wire from the engine compartment fusebox to the fuel pump, which operates. The
fuel pump is connected to earth eyelet connector C0810-1 on a B wire.
the relay contacts and is connected to the coil of the fuel pump relay. An earth path from the
fuel pump coil is connected to the ECM pin C0635-18 on a UP wire. When the ECM
completes the earth path, the coil energises and closes the fuel pump relay contacts.
The feed from fuse 10 passes through the contacts of the fuel pump relay and is connected
on a WP wire from the engine compartment fusebox to the fuel pump, which operates. The
fuel pump is connected to earth eyelet connector C0810-1 on a B wire.
Starter relay operation
When the ignition switch is moved to the crank position III, a feed passes from fuse 23 to the
coil of the starter relay in the engine compartment fusebox on a WR wire.
The coil is earthed to the BCU on a BO wire. When the BCU determines that starter
operation is allowed, the earth path is completed and the starter relay energises, closing the
relay contacts.
The feed from fusible link 12 passes through the starter relay contacts and is connected from
the engine compartment fusebox to the coil of the starter motor solenoid on an NR wire. The
coil energises, closing the starter motor solenoid contacts. The coil is earthed via the starter
motor body.
coil of the starter relay in the engine compartment fusebox on a WR wire.
The coil is earthed to the BCU on a BO wire. When the BCU determines that starter
operation is allowed, the earth path is completed and the starter relay energises, closing the
relay contacts.
The feed from fusible link 12 passes through the starter relay contacts and is connected from
the engine compartment fusebox to the coil of the starter motor solenoid on an NR wire. The
coil energises, closing the starter motor solenoid contacts. The coil is earthed via the starter
motor body.
DESCRIPTION AND OPERATION
4.46
DISCOVERY SERIES II
The feed from the battery positive terminal passes through the closed contacts of the starter
motor solenoid and operates the starter motor. The starter motor is earthed through the
motor body attachment.
When the ignition switch is released, it returns to position II. This terminates the feed from
the ignition switch to the starter relay coil, de-energising the coil and opening the relay
contacts. This, in turn removes the feed from fusible link 12 to the starter motor solenoid coil,
opening the contacts and removing the battery feed to the starter motor.motor solenoid and operates the starter motor. The starter motor is earthed through the
motor body attachment.
When the ignition switch is released, it returns to position II. This terminates the feed from
the ignition switch to the starter relay coil, de-energising the coil and opening the relay
contacts. This, in turn removes the feed from fusible link 12 to the starter motor solenoid coil,
Super Moderator
Joined: Jan 2011
Posts: 16,322
Likes: 88
From: Savannah Georgia
Not sure the Rave will cover gremlins, but it will show you a road map where common points of the circuits converge, one loose connector or bolt is all it would take in the right spot. When in doubt, "shake the plumbing" (wiggle everything like contractors do before they close up the walls).
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