Lotus Esprit Fuel & Water Temp Sender Wiring Diagram - Low Fuel Warning Circuit
Wiring diagram for water temperature gauge, fuel gauge and fuel tank sender showing color-coded splices and low-fuel warning.
This document is an annotated excerpt of a factory-style wiring diagram covering the instrument gauge and sender circuits for a Lotus Esprit, uploaded as 'lotus sender circuit.jpg'. It traces three circuits from Binnacle Splice A (annotated as '12 volts Positive'): the water temperature gauge circuit (wires 14 G, 28 GU, 121 GU, 3 GU, 100 G) through connectors BHC 'A' pin 5, RHC 'A' pin 2, and EMHC pin 6 to the water temperature sender grounded at the engine block; the fuel gauge circuit (10 G, 26 GB, 123 GB) through BHC 'A' pin 3 and RHC 'A' pin 17 to the fuel tank sender; and the low fuel warning lamp circuit (5 G, 24 LGO, 125 LGO) through BHC 'A' pin 4 to a nine-pin low fuel warning lamp delay module. Additional wires include 27 GO to Facia Splice J, 290 B, GO 118 via RHC 'A' pin 20, 445 B, 436 G, and 105 G to Facia Splice X. Hand annotations note that a fuel sender ground wire (B 29 to Rear Splice A) appears 'Omitted', that an empty male spade pin reads 2.8 ohms to ground (suggesting the sender body is the ground), and that the low fuel warning is 'Active @ 2.6 - 2.9 Gal.'
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Frequently asked questions
- What wire connects the fuel gauge to the fuel tank sender?
- Wire 10 G feeds the fuel gauge; from the gauge, wire 26 GB runs through connector BHC 'A' pin 3, becomes 123 GB, passes RHC 'A' pin 17, and reaches the fuel tank sender as GB 26.
- How is the water temperature sender grounded?
- The diagram shows the water temperature sender grounded through the engine block, fed by wire 100 G from connector EMHC pin 6.
- At what fuel level does the low fuel warning become active?
- A hand annotation notes the fuel tank sender's low-fuel switch is 'Active @ 2.6 - 2.9 Gal.'
- What does the annotation about the empty spade pin say?
- It says the empty male spade pin on the fuel tank sender reads 2.8 ohms to ground, suggesting the body of the sender serves as the ground, since the B 29 ground wire to Rear Splice A appears to be omitted.
- What circuit does the low fuel warning lamp use?
- Wire 5 G feeds the low fuel warning lamp, then wire 24 LGO runs through BHC 'A' pin 4, becoming 125 LGO, into the low fuel warning lamp delay module (a 9-pin module, pins 1-9).
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