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    Automotive electrical diagrams provide symbols that represent circuit component functions. For example, a few basic symbols common to electrical schematics are shown as: (1) Switch, (2) Battery, (3) Resistor and (4) Ground.
    Note that the switch symbol displays an open or closed circuit path, which is what an actual switch performs. The battery symbol appears to be made of layers or plates, common to internal battery construction.

    The resistor symbol appears to impede energy flow, which is a resistor function. The case ground symbol indicates a connection pointing downward (ground) that dissipates energy.

    Variations of symbols will exist depending on function or other characteristics. Examples are: Variable Battery symbol (5) and the Case Ground symbol (6).

    Auto wiring diagram advanced symbols


     Abbreviated codes on the diagrams provide circuit path and part or component information. The codes or labels may be used to show circuit connector pin numbers, circuit values or component polarities that will add clarity to the diagnostic drawing. These sets of label examples are:
    (1)A for Amperage or Amps. (2) ORN for wire diameter and color (3)1340 for Circuit Path ID (4)P for pass through grommet (5)A for Pin ID & Location (6)C1 for Terminal Connector ID (7)B+ for battery positive

    automotive wiring electrical symbols


    At first glance, a repair diagram may not convey how wires are of many colors and diameters (or gauges).
    The diameter of each wire symbolized may be indicated by a label placed at some point along side its drawn line (1)(0.8).

    Being aware of the color of a wire is important.(2) Wire color information is provided as a color code label in this case black/white.

    (3)Also shown are common schematic illustrations of wires, (4)wires connected and (5) wires crossed but not connected.

    For consistency in reading, most electrical schematics have signal or energy flow from top to bottom, with component inputs on the left and outputs on the right. With an understanding of how a system would function, the electrical diagram is probably one of the most valuable resources a technician can use in repairing a vehicle.



    When wiring anything in your vehicle that draws heavy current such as high powered offroad lights there are a few things to consider.  Number one, make sure you use wire that is rated for the amperage that the accessories is going to pull.  It is always better to have wire that is OVER rated rather than wire that is not rated high enough.  If wire is used that is not rated to handle the current that your accessory will pull, the result could be overheated wires that could melt the insulation, causing a short or worse yet it could result in a fire.  If you know how much current your accessory will draw you can determine what gauge wire is appropriate for your application.
    Use wire that far exceeds the current draw of accessory.   It’s overkill but in a few applications we’ve used heavy gauge stranded industrial wire with water and chemical resistant insulation. That way there is no question as to whether the wire is rated high enough or not.  If this approach is taken, it is very wise to place a fuse at the battery end as close to the battery as possible.  Most wire in a vehicle, if shorted out, will burn up before the battery overheats and possibly explodes.  If wire that is over-rated for vehicle use is used and a short occurs, a short will most likely result in damage to the vehicle of some sort unless a fuse is put in line as close to the battery as possible.  With the fuse there, in the case of a dead short, the fuse will burn out first before any damage could occur.      
     With accessories that pull a lot of power it is always better to get your power directly from the batteries positive terminal rather than tapping into the existing fuse block or wiring harness.  In most cases the vehicles existing fuse block is not rated to handle the additional load of high powered accessories such as offroad / spot lights.  If you are the kind of person that likes to add all kind of goodies to your vehicle it might be worth installing an additional fuse block that handles non-critical items like offroad lights, CB radios, power inverters, etc.  This additional block can then be powered by a heavy duty wire capable of carrying the current required of all the accessories on the block.  Be sure to fuse the block at the battery.

    In almost every case where high current is required the switch use to turn on the power should not handle the load.  That is better left to a relay.   What is a relay?  A relay is a device that, through a magnetic induction coil, turns on the power for you.  The switch that is installed in the cab of your 4×4 actually only powers the relay itself which draws very little current.  In most  installations a 30 AMP relay from Radio Shack (Auto Relay Cat. Number 275-226) will do unless your amperage demands exceed 30 amps.  Use a lighted or illuminated light switch in the cab to let us know if driving lights are on.
    Offroad Lights or Accessory Wiring Diagram using a 4 – Pole Relay Relay

    The method used for wiring the lights and other external accessories, for the most part, follows the diagram pictured above.  As in the diagram a wire is run from a 12 volt power source to the switch in the cab and out to the relay placing a fuse at the source of the power.  (Follow the relay’s wiring schematic when connecting the wires to the relay)  One of the relays terminals goes to ground.  Then run a heavy gauge wire from the battery to the relay placing a 30 Amp fuse in line very close to the battery.  Do not connect the power to the battery until all wiring is done.   Then I run a single heavy gauge wire out to the lights or other accessory. If installing lights, split it into two leads at the lights.  If you do this be sure the wire is rated to handle BOTH lights since it will carry the current of both.  The diagram shows two leads coming from the relay.  Then I run the second wire of the lights or other accessory to a good ground on the frame of the vehicle.  If the wires will not be soldered together and crimped connectors will be used it’s a good idea to put a dielectric paste on the connectors where they come in contact.  This will prevent corrosion as time passes ensuring a good connection.   Then double-checked all wiring before plugging in the power.  

    Ohms Law

    Ohm’s Law Defined

    Ohm’s Law defines the relationships between (P) power, (E) voltage, (I) current, and (R) resistance. One ohm is the resistance value through which one volt will maintain a current of one ampere.
    ( I ) Current is what flows on a wire or conductor. Current is measured in (A) amperes or amps.

    ( E ) Voltage is the difference in electrical potential between two points in a circuit. It’s the push or pressure behind current flow through a circuit, and is measured in (V) volts.

    ( R ) Resistance determines how much current will flow through a component. Resistors are used to control voltage and current levels. The higher the resistance, the smaller the amount of current is allowed to flow. Resistance is measured in ohms.

    ( P ) Power is the amount of current times the voltage level at a given point measured in wattage or watts.

    V = I x R
    I = V / R
    R = V / I 

    Alternative Offroad Lights or spotlights or Accessory Wiring Diagram using a Relay


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    69 Responses

    1. Add2riez says:

      Macam mana saya nak pasang switch dengan relay untuk pre amp?boleh tunjuk diagram tak?pre amp saya ada 3 wire
      12+,REM,GND…switch pula yang 3 pin(light switch) Relay 5 pin…

    2. azameel says:

      bro, setau saya amp or pre amp xyah pakai relay, sbab die dh ade circuit relay dlm pre amp tu
      12+ sambung kat power source
      Gnd – kat ground or mane2 wire negative
      Rem- sambung kat player, cari wire ade tulis (power antenna or remote) biasenye kaler biru
      function REM ni, bile ko on radio, pre amp tu nyale skali

    3. az says:

      hai.. nak tanye sket, aritu aku pg pasang fog lamp baru, then org kedai eksesori tu cakp kena pasang relay but aku refuse coz yg asal dulu pun tak pakai. relay ni sebenyarnye utk ape ? kalo tak pasang ape efectnya?

    4. kdi says:

      relay ni fungsi sbg remote switch yang mana dapat pastikan bekalan arus elektrik ke lampu cukup walupun switch tu jauh dgn wayar yang panjang dan rintangan tinggi. so relay penting utk bekalkan kuasa maksimum pada lampu tersebut spy terang dan cerah

    5. ab says:

      hai, nak tanya sikit.saya ada pasang fog lamp.apa yg sy tgk pemasangan fog lamp kat kereta sy tak ada disambungkan dengan relay..power dr bateri cuma sambungkan dengan fius sahaja..yang jadi masalahnya saya dah banyak kali tukar fius sebab fius cair/terbakar.mentol kereta pon dah 2 kali tukar dalam tempoh setahun..boleh saya tahu apa puncanya dan cara nak atasinya?terima kasih.

    6. kdi says:

      Ab, kereta ape tu? Confirm ke takde relay? Kalo takde, kena letak la.. x boleh buat direct wiring utk high electric consumption device

    7. joe says:

      ..hai.boleh bagi diagram pemasangan foglamp dgn side marker utk kereta waja…kena pakai relay jgak ke?

    8. nasrul says:

      nk mcm mana nk bypass alarm?

    9. kriz says:

      Utk relay fan radiator brp Amp yg harus digunakan utk proton wira?sebab relay yg saya gunakan skrg tidak ada dinyatakan spec.

    10. steven says:

      How many type of connector in proton’s persona and how many pcs of connector in this car too ?

    11. ery says:

      salam..tuan..saya ade masaalah..saya baru replace rear bonet satria 2003 kepada bonet satria gti..masaalahnya bila saya remove original bonet(terpaksa potong wire) saya dapati amount wire pada bonet gti x sebanyak wiring pada bonet asal satria 2003..saya berjaya wirekan rear wiper sahaja..brake light pada spoiler, heater dan lampu plate x jumpa wiring..lagi satu..kereta saya dah jadi mcm lampu circus…bagi blinker kiri dia jadi kanan..bg blinker kanan jadi kiri..on headlights tu yg macam terus jadi lampu fun fair…ape,yg patut saya buat..terima kasih

    12. azlee says:

      hi,saya ada nasaalah lampu depan.sekarang assesory sudah madify pakai lampu putih.boleh tak tuan bagi sy diagram original lampu depan naza citra.

    13. linns says:

      apa guna relay kecil disebelah bawah dashboard saga blm bahagian penumpang (kiri)

    14. Padil says:

      Hai. Hari ni sy pegi kedai kerana ada masalah pada fuse fan saya. Kipas tak jalan. Lepas da tuka fuse baru still rosak tk jalan juga kipas. Temperature naik balik. Sy pon dtg kedai semula and pomen kata kena buka kt bawah tapak dye kena tuka. Da berpeloh da ni 2kali dtg balik. Aduiiiii jemmmm

    15. Padil says:

      Dahla dye bg fuse second.. harge plak mcm fuse baru. Lepas tuh balik lg rosak balik… sabo jela. Ni pehatikan jea suruh dye buat balik. Ape lg yg nak di akal kannye lepas ni plak.

    16. nizam says:

      hai bro nak minta tolong siarkn circuit diagram radiator fan dan fan condenser..adkh wayar negetif control coil relay dapd ecu

    17. nizam says:

      kereta waja campro 1.6

    18. abdfadil says:

      hai … saya ada masallah dgn center lock x fungsi kekadang ok guna kan remote pun x boleh apa masallah nya

    19. Fadzil says:

      Apa perbezaan Relay 30/40/60/80 Ampere?kedai ckp same je..tu yg x pasti mcm mna tuh

    20. hafiz says:

      Aslmkum. Bro nak tanya ckit. Kawan ada pasang fog light baru dekat bumper depan tapi kerap shorting ,dalam setahun ada 2x. Kawan pakai wira,kalau sambung terus dekat wire lampu bumper boleh tak? Kan wira ada satu lampu kecil dekat bawah bumper. harap bagi petunjuk

    21. Mohd azizi says:

      Hai nk ty
      Kereta myvi sy lampu abs sentiasa nyala.
      Apa penyebab dan solution

    22. Jerry says:

      salam tn.. nak tanya sikit ttng kereta gen2.. ari tu sya ada buat wiring alarm dkt satu kedai akssri krta.. kena tukar alarm lama sbp rosak kena air.. tpi bila dh tkar baru smpi rumah semalaman batery krta weak pla.. ingatkn btry dh rosak dn siap tukar sebiji baru.. lps tukar, mslh mc sama, sdh tkr bila semalaman ja batry sdh kong/weak.. apsal tu ya.. ada mslh wiring kh?

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    26. kinot says:

      hi bro bro otai semua..mcm mne nak install poweramp pada kereta auto (myvvi advance) dengan audio player built in monitor.pengetahuan saye agak asas tentang keselamatan sewaktu penyambungan wayar.masalanya saya tak pernah buka player untuk sambungkan remote amp ke player.tak tau nak buka skru mana pun malah skru pun tak nampak.risau main cungkil je.

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    64. Fadzli Edogawa says:

      Kereta wira 1.6. Tiba2 Power windows tak jalan, central lock tak jalan, Blower Aircond tak jalan, yang lain ok.. cek dekat fius tak terbakar tapi ada setengah fius karen tak masuk dari main. Kat mana nak cek lagi? ada relay ker sebelum masuk ke fius?

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