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DeLoreanOwnersManual-Fuses

All of the fused circuits are routed through the fuse box located in the relay compartment behind the passenger seat. There are 17 fuses in use, and one spare, in the fuse box[1]. The radio also has two inline fuses which are located at that unit.

Fuses Edit

CommonAutoFuses

Common ATO-style automative fuses for various amperages.

FullSizeAndMiniFuses

A full-size ATO and mini automotive fuse, 10 amps. Mini fuses are used in some aftermarket DeLorean additions, such as the Lockzilla keyless entry module.

The DeLorean uses standard "ATO"-style two-terminal automotive fuses. Fuses are rated in amps, and can be identified by their rating through their color and the white number clearly displayed on the top edge. The fuses body is a plastic housings with two metal blade-style connectors on one end. A window on the front of the fuse makes it fairly simple to tell if a fuse is blown by checking to see if the metal "S" or zig-zag within is intact. Fuses can also be tested via the two exposed metal contacts flaking the numerical amperage rating on the top of the fuse.

More information about automative fuses can be found on Wikipedia, including photographs and common color codes.

Fuse Box Edit

As mentioned above, the fuse box is located behind the passenger seat. It is accessed by removing the carpet on the parcel shelf and lifting out the plywood access cover. The cover of the fuse box is labeled with the function of the fuses.

Troubleshooting Edit

Checking and Replacing Fuses Edit

If any part of the car's electrical system fails to function, a good first place to look is the fuse box. The cover of the fuse box, the chart below, the Owners Manual and the DeLorean Owners Manual can help you find which fuse is used for which function. Pull the appropriate fuse and check the window to see if the metal is intact. If it is missing or burned through, then the fuse is needs to be replaced. Pliers can be helpful when removing fuses.

Always replace blown fuses with those of similar ratings. Using a fuse smaller than the actual operating load of circuit will cause it to blow immediately, while using too large of fuse may keep it from blowing when it should. Fuses should never be bypassed with a piece of wire or other metal, as this can destroy the component the fuse protects, or start a fire by putting more amperage through the wires than they can take.

Intermittent Operation Edit

InlineFuseHolder

An inline fuse holder with a 30 amp ATO fuse installed. Inline fuses are commonly used to fuse aftermarket modifications and to bypass bad fuse sockets in the fuse box.

If you have intermittent operation of an electrical component, it may be due to a bad fuse contact. This can sometimes be spotted by wiggling the fuse in the holder, causing the circuit to temporarily come to life. Often the fuse box has melted due to heat, or a wire has become damaged at the holder. Simply replacing the fuse won't fix this problem.

An interim solution is to jump around the fuse. After disconnecting the battery, you need to lifting the fuse box so you can get access to the wires underneath. Unfortunately, the wires are quite short, so the holder cannot pulled out very far. You can cut the two wires that go to that fuse, and splice in an inline fuse holder from an auto parts store.

A more permanent solution is to replace the fuse box.

Constantly Blowing Fuse Edit

A fuse that continually blows out can be caused by a short in the system or dirty fuse contacts.

A short to ground my be intermittent, causing the fuse to blow out occasionally. The only way to fix this is to trace the wires looking for bad connections.

Dirty fuse contacts on fuses or relays and damaged can increase the resistance by requiring the same amount of power to pass through a smaller area. This increases the amperage in the circuit, possibly to the point of exceeding the fuse rating and thus blowing the fuse. Cleaning various contacts may help, including the fuse socket, relay sockets, and any screwed-down or plug-in wires, including grounds on the frame.

Hot Fuses and Melted Fuse Box Edit

Excessive heat from the fuses can cause the plastic fuse box to melt. This is most often an issue for the for the headlight fuse. The heat causes the fuse box to soften and warp, spreading the contacts so that the fuse slips. It may be difficult or impossible to get the fuse to sit securely in the socket once this has occurred. The melted socket can be bypassed with an inline fuse holder as described above, but the best solution is to replace the fuse box with a new one.

A common cause for hot fuses is dirty or loose fuse sockets. This increases the resistance and thus produces more heat. Cleaning the fuse socket and slightly bending the contacts to improve the connection may help reduce the heat. See also the alternate fuse ratings section below about using alternate fuses for select circuits in specific conditions to reduce fuse temperature.

Replacing the Fuse Box Edit

The fuse box can be replaced with a new one. Various DeLorean vendors carry improved fuse boxes with larger terminals to reduce heat. Special T Auto also sells an alternative, heavy-duty fuse box. It takes between three and six hours to replace the fuse box. It isn't so much difficult as it is tedious, as a total of thirty four wires need to be routed from the old box to the new.

Stainless DeLorean on DMCTalk has detailed how to replace the fuse box with an upgraded DeLorean one. He lists the various tools needed not only to remove the existing fuse box, but to repair and splice any damaged wires you may encounter. For improved access, he also removed the passenger seat. He takes great care to keep track of the wires to ensure that everything is wired properly into the new box.

Fuse Ratings and Function Table Edit

The Workshop Manual[1] and Owners Manual[2] give different descriptions for which circuits are protected by each fuse, although they are consistent with each other. For completeness, both sets of information are listed below.

Fuse Ratings Edit

The diagram below lists the original fuse ratings that shipped with the car. These can be found in the Workshop Manual and Owners Manual.

Fuse Number Factory Rating (Amps) Supply Circuit Protected
(Workshop Manual)[1]
Circuit Protected
(Owners Manual)[2]
1 10 Amps
(red)
From Ignition II RPM relay
Distributor vacuum solenoid
Ignition ECU
Idle speed ECU.
Warm up regulator
Ignition control unit
Idle speed regulator
2 10 Amps
(red)
Only supplied when light switch operated Left tail lamp
Side lamps
Front parking lamp
License plate lamp
LH taillight
LH rear side marker
LH license plate
LH front side marker
LH Front Parking Light
3 10 Amps
(red)
From Ignition II Windshield wiper
Washer motors
Windshield wiper
Windshield washer
4 20 Amps
(yellow)
From Ignition II Directional indicator switch
Stop light switch
Direction indicators
Turn signal lamps
5 10 Amps
(red)
From Ignition II All dash instruments and indicators
Service interval counter
Cool fan relay
Voltage regulator "charge" lamp circuit
Lambda service counter
Seat belt warning light
Door ajar warning light
Temp. gauge
Oil pressure gauge
Fuel gauge
Oil, battery fuel, brake warning lights
Voltmeter
Tachometer
Radiator cooling fans control
6 20 Amps
(yellow)
Permanently live Hazard warning switch
Horns
Buzzer logic box
Stop lamps
Horns
Headlamp flashing switch
Buzzer logic box
Hazard warning lamps
7 20 Amps
(yellow)
Permanently live Lambda relay
Lambda ECU
Frequency valve
Fuel pump
Control pressure regulator
Lambda control unit
Fuel pump
8 10 Amps
(red)
Only supplied when light switch operated Right tail lamp
Side lamps
Front parking lamp
License plate lamp
Cigar lighter lamp
Instrument panel illumination lamps
main light switch lamp
hazard warning switch lamp
and digital clock lamp
Cigar lighter illumination
RH license plate
RH tail lamp
RH rear side marker
RH front park light
RH front side marker
Instrument illumination
Clock dimmer
9 10 Amps
(red)
From Ignition I Heated rear window
electric mirrors
Heated rear window
Door mirrors
10 20 Amps
(yellow)
From Ignition I A/C mode switch
Door lock warning lamp
Lock doors warning light
Fan speeds 1 & 2
Fan speeds 3 & 4 control
Air conditioning compressor
11 30 Amps
(green)
From Ignition I Radio
clock
Gear selector lamp
A/C panel lamps
Power windows
Gear illumination (automatic transmission)
Door windows
Air conditioning panel illumination
Radio display
Clock illumination
12 10 Amps
(red)
Permanently live Diagnostic plug
Engine compartment lamp
Luggage compartment lamp
Glove box lamp
Door lamps
Interior lamps
Interior lamp delay unit
Door lamps
Rear interior lamp
Front interior lamp
Glove box lamp
Luggage compartment lamp
Engine compartment lamp
Engine diagnostics
13 10 Amps
(red)
From Ignition I Automatic transmission Automatic transmission
14 20 Amps
(yellow)
Supplied when low beam is switched Low-beam headlamps Low beam
15 20 Amps
(yellow)
Supplied when high beam is switched High-beam headlamps High beam
16 10 Amps
(red)
From ignition I Reverse lamps Back-up lights
17 20 Amps
(yellow)
Permanently live Cigar lighter
Clocks
Cigar lighter
Clock supply
Radio supply
18 20 Amps
(yellow)
Spare fuse

Inline Fuses Edit

These inline fuses are attached directly to wires on the radio.

Rating (Amps) Circuit Protected/Location
1 Amp
(black)
Radio purple wire.
5 Amp
(brown)
Radio light green wire.

Alternate Fuse Ratings Edit

The above table includes the factory-recommended DeLorean fuses. Elvis, an electrical engineer on DMCTalk, found a [discussion on the german DeLoreans.de forum that determined the standard high beam, low beam and stop light fuses run very close to their maximum limits. This causes the fuses to get very hot, over 300° C in some cases. Replacing these fuses with slightly higher ratings drastically reduces the heat dissipated and increases the life of the fuse box.

It is believed that this is directly dependent on the headlights you have installed. Cars using the factory sealed beam headlights draw less power than those upgraded to H4 halogen bulbs, as is common in Europe and may have been done by owners in the US to get brighter lights. Note that all sealed beam lights are not immune, Silvania Silverstar bulbs draw 55 to 65 watts as well[3].

It is important to note that this may be less of an issue for owners with the original DeLorean headlights rated at around 40 watts. Aftermarket headlights may draw 55 to 65 watts, putting a greater strain on the electrical system and driving the fuses closer to their failure points. This increases the heat and may melt the fuse box. This is especially true for european DeLoreans, as they are required to use the higher-wattage H4 halogen bulbs in place of the factory-installed sealed-beam units used in the US[4].

The stop light fuse and Lambda/fuel pump fuse were also found to run hot at times, and so this is also included in the alternate fuse table below.

Not that you should NOT simply replace any hot fuse you find with a higher rated fuse, as this may be dangerous. Always use properly rated fuses, as described above. These specific replacements are believed to be safe, but other replacements may be dangerous and can damage the DeLorean's electrical system if not done properly.

Fuse Number Original Rating (Amps) Alternate Rating (Amps) Supply Circuit Protected
(Workshop Manual)[1]
Circuit Protected
(Owners Manual)[2]
6 20 Amps
(yellow)
25 Amps
(clear/natural)
Permanently live Hazard warning switch
Horns
Buzzer logic box
Stop lamps
Horns
Headlamp flashing switch
Buzzer logic box
Hazard warning lamps
7 20 Amps
(yellow)
25 Amps
(clear/natural)
Permanently live Lambda relay
Lambda ECU
Frequency valve
Fuel pump
Control pressure regulator
Lambda control unit
Fuel pump
14 20 Amps
(yellow)
25 Amps
(clear/natural)
Supplied when low beam is switched Low-beam headlamps Low beam
15 20 Amps
(yellow)
25 Amps (medium draw headlights)
(clear/natural)
30 Amps (high draw headlights)
(green)
Supplied when high beam is switched High-beam headlamps High beam

Parts Edit

  • 106912: Fuse Box, original
  • 106912N : Fuse Box, improved, with terminals, fuses and cover
  • 106913 : Fuse Box, improved, with terminals and fuses
  • Special T Auto Fuse Box, alternative heavy-duty design

External Links Edit

See Also Edit

References Edit

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