![]() ![]() Is this (A) the TCSA switch? Certainly a microswitch as per the original description I had read, and it closes in Reverse, 2nd and 4th as the gear change shaft (B) moves forwards in those gears: MGB LAYCOCK OVERDRIVE TRANSMISSION MANUALWith this arrangement the output of the gearbox switch fed both the Overdrive manual switch and the TCSA solenoid directly, so OD was only available in 4th gear. In Feb 77, possibly due to unreliability or cost considerations, the microswitch was deleted and the Overdrive switch arrangements changed to operate in 4th gear only, feeding both the TCSA and Overdrive. vacuum advance to be enabled in 4th gear only whilst Overdrive was still available in both 3rd and 4th. Wiring these two switches in series allowed the TCSA i.e. MGB LAYCOCK OVERDRIVE TRANSMISSION PLUSNote: For a few months from late 76 to Feb 77 the original gearbox Overdrive switch operating in 3rd and 4th was used plus an additional TCSA (Transmission Controlled Spark Advance) microswitch operating in Reverse, 2nd and 4th. ( Image by David Farrar on the MGOC Forum) This picture shows the yellow wire from the manual switch coming out of the main harness, joined to a yellow/red going into the gearbox harness. But a fault in the OD or TCSA wiring will also cut off the fuel pump, so it is better to use two fuses - one in each of the wires coming from the 4-way bullet connector at B. However there is also position B: In the wire from the inertia switch a single fuse will protect the OD, TCSA and fuel pump. LH type with ignition relay - North America (77-on):Ī fuse inserted at A will protect both the OD and the TCSA circuits, this is probably where the gearbox harness joins the main harness. On cars with the gear-lever mounted switch to protect the most wiring a fuse can only be inserted at A where the gearbox harness joins the main harness. LH type with ignition relay - UK (77-on): On cars with the column switch - to avoid cutting wires - insert it at B where the gearbox harness joins the main harness below the pedal box. On cars with the dash-mounted manual switch to protect the most wiring insert the fuse in the white wire at A where it connects to the back of the switch. LH type without ignition relay (68-76 and V8): Overdrive - LH-Type LH type without ignition relay LH type with ignition relay - UK LH type with ignition relay - North America Location of gearbox switch ![]()
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