BMW E21 Harnesses

  

E21 Chassis Years and Models included (But not limited to):  

  • 75-83    320i, 323i

  

The original engines from the chassis listed above include the M10 and M20

*If you are planning on using an automatic transmission, please send us a message.

  

LIFETIME Warranty with all harnesses!

This warranty only extends to the original purchaser and is limited to workmanship only. If you have any problem with these, just send us a message and we will take care of it.

  

**If you plan to use a Z3, M Roadster, or M Coupe harness or chassis, please let us know.**

  

We provide harness adapters for all of the following engines:

  • M50
  • S50 (US and Euro)
  • M52 (Single vanos)
  • S52
  • M52TU (Double Vanos)
  • M54
  • S54 (US and Euro)
  • M60 or M62 (obd1)
  • M62TU (obd2)
  • S62

  

We have our own complete diagrams for each of these motors and chassis. We have spent our own time figuring these setups out. For the newer M52TU, M54, S54, M62TU, and S62 motors, we used the E39 and E46 ETM which is available online or in book form for these diagrams. Therefore the E46 or E39 harnesses are desired. The standard S54 harness can reach the original ECU location in the glovebox on the E30. I will provide a link on the instruction sheet to assist you and possibly make it work the same for the E21.

  

All fuses and relays are included with all harnesses. With an exception of the USA Timed EKP modul fuel pump relay for the S54 and S62 harness.

All harnesses have been measured out for LHD vehicles and placing the DME in the glovebox compartment. RHD is available upon request.

The M52TU, M54, and S54 come standard for the E46 engine harness, please let us know if you plan to use another option. (Z3M, E39, X5,etc.)

The M62TU and S62 come standard for the E39/M5 engine harness, please let us know if you plan to use another option.

  

Detailed instructions are included with all harnesses

  

  

  

EWS must be deleted.

We now offer the M52TU, M54 (B22, B25, and B30), S54, and S62 EWS deletes (Free, with a purchase of an adapter harness). Just send us your ECU to be modified.

**$70 value without a purchase of a harness.  

  

We will assist as much as we can throughout your entire engine swap.

  

These can all be customized to order. Please let us know if you have any special requests.

M50/S50/M52/S52 obd1 for E21

These adapters include the following:

  • Cluster temperature wiring  
  • Fuel pump wiring
  • Oil pressure wiring
  • Alternator wiring (Battery Charge light)
  • Tachometer wiring
  • Etc..

 

  • OPTIONAL: CEL wiring with bulb
E21 Year
Options List
E21 Model (EX: 320i)

M52/S52 obd2 for E21

These adapters include the following:

  • Cluster temperature wiring  
  • Fuel pump wiring
  • Oil pressure wiring
  • Alternator wiring (Battery Charge light)
  • Tachometer wiring
  • Etc..

 

  • OPTIONAL: CEL wiring with bulb

 

E21 Year
Options List
E21 Model (EX: 320i)

M52TU for E21

**Must use with MS42 DME

These adapters include the following:

  • Cluster temperature connector
  • OBD2 diagnostic port
  • Fuel pump wiring and relay

  

  • OPTIONAL: SAP relay and connector
E21 Year
Options List
E21 Model (EX: 320i)

M54 for E21  

**Must use with MS43 DME 

These adapters include the following:

  • Cluster temperature connector
  • OBD2 diagnostic port
  • Fuel pump wiring and relay
  • Electronic accelerator pedal connector

  

  • OPTIONAL: SAP relay and connector
E21 Year
Options List
E21 Model (EX: 320i)

S54 for E21

 **Must use with MSS54 DME

Please let us know which engine harness and transmission harness you plan on using.

**These will require the Timed EKP modul fuel pump relay BMW Part# 61357892976. This relay is not included.

  

These adapters include the following:

  • Cluster temperature connector
  • OBD2 diagnostic port
  • Fuel pump wiring, NO relay (Instructions included)
  • Electronic accelerator pedal connector
  • Momentary switch for Sport Mode

  

  • OPTIONAL: SAP relay and connector
  • OPTIONAL: Euro fuel pump wiring (Relay included)  
E21 Year
Options List
E21 Model (EX: 320i)
FP relay style (USA or Euro)

M60/M62 obd1 for E21

 These adapters include the following:

  • Rectangular "c101" Chassis Connector
  •  X20 Engine Connector
  • Cluster temperature wiring

  

  • OPTIONAL: CEL wiring with bulb   
E21 Year
Options List
E21 Model (EX: 320i)

M62TU obd2 for E21

Best used with the E39 engine harness.

  

These adapters include the following:

  • Cluster temperature connector
  • OBD2 diagnostic port
  • Fuel pump wiring and relay
  • Electronic accelerator pedal connector

  

  • OPTIONAL: SAP relay and connector
E21 Year
Options List
E21 Model (EX: 320i)

S62 for E21

**Must use with MSS52 DME  

**These will require the Timed EKP modul fuel pump relay BMW Part# 61357892976. This relay is not included.

Best used with the E39/M5 engine harness.

  

These adapters include the following:

  • Cluster temperature connector
  • OBD2 diagnostic port
  • Fuel pump wiring, NO relay (Instructions included)
  • Electronic accelerator pedal connector
  • Momentary switch for Sport Mode

  

  • OPTIONAL: SAP relay and connector
  • OPTIONAL: Euro fuel pump wiring (Relay included)  
E21 Year
Options List
E21 Model (EX: 320i)
FP relay style (USA or Euro)
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