As always, what year? The D-type fitted to 3-sync gearboxes had two coils - a
pull-in measuring 0.7 ohms which draws 17 amps, and a hold-in which measures 6
ohms and draws 2 amps. The 4-sync LH-type has only one winding which measures
15 ohms and draws 800 milliamps.
If you suspect an electrical problem the best path is to insert an ammeter in
series rather than measure the resistance. There is usually a convenient
connector where the gearbox harness joins the D-type sub-harness (yellow/red
to yellow) and the LH-type joins the main harness. The colours for the LH
depends on whether you have the dash, column or gear-lever manual switch.
Remember to turn on the ignition and manual OD switches and select an OD to
see current flow. If there is no current flow change the meter to voltage and
see if you have 12v present. If you have then there is an open-circuit
somewhere between your ammeter and the physical ground at the solenoid. If
you don't see 12v then there is an open-circuit back towards the ignition
circuit.
Even if the electrical tests are OK the solenoid could still be at fault if
the plunger is mechanically jammed in the solenoid coil, or if it is out of
adjustment in the case of the D-type.
PaulH.
----- Original Message -----
Does anyone know what the resistance of the OD solinoid is or what
the current draw should be when it is engaged ?
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