Circuit for interfacing brake, turn, and hazard warning signals

Details Circuit for interfacing brake, turn, and hazard warning signals Circuit for interfacing brake, turn, and hazard warning signals

1996-06-26

1997-10-14

Hofsass, Jeffery

Communications: electrical

Land vehicle alarms or indicators

External signal light system

340431, 340464, 340465, 340468, 340471, 340475, 307 108, 188 111, B60Q 144

Patent

active

056776713

ABSTRACT:
A circuit for the electrical system of an automotive vehicle, such as a truck, interfaces a brake switch, a combination turn signal/hazard warning signal switch, and an engine electronic control module (ECM) that has two separate brake signal inputs. The circuit is especially useful when the vehicle engine has a power take-off (PTO) to prevent unintended interruption of power flow through the PTO to an accessory device, such as a salt spreader, hydraulic pump, air compressor, etc. The circuit can be fabricated from conventional circuit components. A pre-existing vehicle can be retrofitted with the circuit by a jumper harness.

REFERENCES:
patent: 5121723 (1992-06-01), Stepper et al.
patent: 5343780 (1994-09-01), McDaniel et al.
patent: 5585784 (1996-12-01), Pabla et al.
"Electrical Circuit Diagrams" Manual No. CTS-5122S (Jan. 1995) Navistar International Transportation Corp., 1994, pp. 30, 95, 196.

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