Short the two wires together that plug into the backup light switch.  If
the light work, bad switch.

Good Luck.

-Dick-

On Fri, Sep 27, 2013 at 9:04 AM, mark drillock <mdrillock@cox.net> wrote:

> I know the diagrams don't show this but something is making me think
> there is an inline fuse for the backup lights inside the engine
> compartment wiring box. I think for older vans like 83/84.
>
> Mark
>
>
> Jim Felder wrote:
>
>> I had a few minutes between errands to jack the car up and look. Found a
>> loose connection on one of the pair. Fixed that, no dice. Got out
>> voltmeter, knob broke. Grabbed another one. Looked for continuity between
>> the blades of the switch and found none. Looked for 12v from either of the
>> wires and found none. Looked for a bad fuse and found none.
>>
>> All this with the stick in reverse and the switch on, engine not running.
>>
>> Jim
>>
>>
>>