[Mgs] Overdrive does not work when it is hot. Checking for an open circuit

[Paul Hunt]

Indeed, but you won't know if the right amount of current is flowing.  OK to 
detect a full break in the circuit, but not a high-resistance connection. 
It will almost certainly stop the OD engaging anyway, so you won't know 
whether it is 'normal' or a fault condition, unless you happen to notice it 
change brightness.  But it will be doing *that* anyway, as the alternator 
output varies.

PaulH.

----- Original Message ----- 
> Lacking an ammeter, an electrical test that I used was to put a 12V bulb 
> in series with the overdrive electrics. Did this under the hood, a.k.a. 
> bonnet, where the connector to the o/d is located. With the ignition on 
> and the gearbox in 3rd or 4th and, of course, the overdrive switch "on", 
> the light will illuminate dimly if there's continuity to ground through 
> the various wires, isolator switch, and solenoid.