FAQ

How do I use the online harness finder?

There is a user guide for the finder here

How do I log into my online account?

There is a user guide here

How do I change the password on my online account?

There is a user guide here

How do I register for a trade account?

There is a user guide here

Will my harness come with the battery cables?

Our Harnesses do not come with Battery Cables. Where we have the specification for these, they will appear in the listing for your vehicle. We will always offer them as an option rather than including them. If we do not list them, then all parts are available in the Electrical Components section of our Website.

Pre-Engaged Starters

A Pre-Engaged starter motor will make the existing Starter Solenoid redundant. In most instances this is where the wiring harness picks up power from the battery. 

What does this mean for the modified harness?

The battery pick up is now on the actual Starter Motor, so we need to extend the old Solenoid position (on the harness) to the Starter motor. We need the additional length taking into consideration routing through the engine bay i.e. the distance from the old solenoid to the new starter motor.

Do you have a guide for the colour coding of each harness?

All Harnesses for English Vehicles are manufactured using the British Standard Colour Code which was used by the manufacturer at the time. For a full list click  here.

Can you recover my existing harness?

PVC Taped Harnesses can easily be done by the Owner. Harness Tape is available in the Electrical Component section of our Website.

Recovering a Braided Harness is something that has to be done in-house and we offer a braiding service whereby we can braid your original or custom harness. The cost is £2.85 per foot plus return carriage & VAT.

We endeavour to turn these jobs around as soon as possible.

To prepare your harness:

  • Remove all the old original braiding (if there is any)
  • Indicate where you would like the braid to start and finish, by using adhesive tape where the end of the braid is required.
  • Enclose a cover letter with your parcel with contact details
  • Advise if you would like a coloured fleck in your new braid. If you are unsure just advise what vehicle the wiring loom came off and we can check it against our patterns.
  • Once your harness is ready we will then contact you for payment details and a final cost.

Please note: We cannot braid single wires.

If you would like any more information on this service please contact sales@autosparks.co.uk

Can I send you my original harness?

If you need a harness for a vehicle but we've never seen a pattern for it we may be able to replicate your orignal harness, in this case you need to contact us to discuss the matter, then, if we do need to see your original please download the form here and send it in along with the harness.

I'm building a kit car, do you have a harness that I could use?

Yes, we have a range of kit car wiring harnesses, further information can be found here.

Can you fit my harness for me?

We only manufacture and distribute our harnesses to customers, we do not fit them.

Can I return items that I do not want?

Stock items can usually be returned within 7 days subject to a handling fee.  Stock orders that required no bespoke work can usually be cancelled prior to despatch at no cost..  Harnesses that have to be manufactured or have bespoke work / modifications are not usually eligible for return.

How will I receive my order?

Click here to see our delivery charge information

Headlamp Pigtails

On most vehicles the Harness ends short of the Headlamps, and Headlamp Pigtails connect the Harness to the Headlamps them selves. As Headlamps are sometimes supplied with these, and in other cases, customers do not wish to replace them, we offer them a separate item within our Electrical Components section.

9 or 14 strand cable?

We have been criticised in the past for using 9 strand cable when it was never used originally. This was because in the old days Lucas manufactured two sizes of 14 strand cable. 14/0.10 (14/0.25mm) and 14/0.12 cable. (14/0.30mm). As all of the larger sizes of cables had a strand size of 0.12 (0.30mm), Lucas rationalised their manufacturing and replaced the odd 14/0.10 cable with 9/0.12 (9/0.30mm) giving an equal carrying capacity.

Front Lamps / Rear Lamps

Generally a Harness will go all the way to the rear lights and connect to either the lamp itself, or to wires that are attached to the lamp. Traditionally the Harness at the front end would end with bullet connectors inboard of the headlamps. This would then need Headlamp Leads, usually around three feet long, to go out to the lamps themselves. We can supply these as separate parts if required. Please see our Electrical Components section of the Website.

Bullet Sleeves

Our general rule is to fit any bullet connecting sleeves larger than a single one. This removes the question of which wires to fit in which connector at certain points.  Single Connectors, and any extra larger ones are available in our Electrical Components section of the Website.

Bulb Holders

Due to the unavailability of many of the original metal bulbholders, plastic replacements are fitted which take a modern capless bulb. A large range of Bulbs can be found in our Electrical Components section.

The common replacements that we use are:

Replacement holders for a BA7S 12V 2W panel & warning light bulb take a 12V 1.2W Capless bulb which can be found here

Replacement holders for a 12V 2.2W panel bulb take a 12V 3W Capless bulb which can be found here

Modification - Online Circuit Diagrams

Diagrams for all of the modifications available as options on the Website are available here 

Rolls Royce Wire Sizes

This is the conversion from Rolls Royce wire sizes

Rolls Royce Size Strand
23/36 14 strand
40/36 28 strand
90/36 44 strand

 American Wire Gauge (AWG)

This is the conversion chart for American Wire gauge (AWG) sizes

AWG Strand
19 9
17 14
14 28
12 44
10 65
9 84
8 97
8 120

Metric Conversion Chart

Inches 1/8" 3/16" 1/4" 5/16" 3/8" 1/2" 5/8"
Millimetres 4mm 5mm 6mm 8mm 10mm 12mm 16mm

Cable Application guide

PVC & Braided Cable

Size Cross Section Nominal O/D Carrying Capacity General Use

9/0.3

0.65mm2

2.35mm

5.75 Amps

LT Ignition

Side & Tail Lamps 

General Wiring

14/0.3

1.0mm2

2.55mm

8.75 Amps

28/0.3 2.0mm2 3.15mm 17 Amps

Headlamps

Major Accessory Feeds

44/0.3 3.0mm2 3.95mm 25 Amps

Dynamo

Control Box

Ammeter

65/0.3 4.5mm2 4.85mm 35 Amps

Alternator Feed

Ammeter

84/0.3 6.0mm2 5.7mm 42 Amps
120/0.3 8.5mm2 6.8mm 60 Amps

Thin Wall Cable

Size Cross Section Nominal O/D Carrying Capacity
16/0.2 0.50mm2 1.7mm 11 Amps
24/0.2 0.75mm2 1.9mm 14 Amps
32/0.2 1.00mm2 2.1mm 16.5 Amps
28/0.3 2.00mm2 2.7mm 25 Amps
44/0.3 3.00mm2 3.4mm 33 Amps
65/0.3 4.5mm2 4.1mm 42 Amps
84/0.3 6.00mm2 4.3mm 50 Amps
120/0.3 8.50mm2 5.6mm 63 Amps
80/0.4 10.00mm2 6.0mm 70 Amps