Instrumnent Lights - 2 wire bulb holder

Duk41

Bigger Hammer
All-Star
May 11, 2017
199
Waihi, New Zealand
First Name
Col
Willys Model
  1. Pickup
Willys Year:
  1. 1959
Nearly finished complete rewire from scratch and no smoke got out yet.
Instrument cluster is last thing - when I dismantled everything years ago didn't note what was what like I did with everything else..

Have it figured mostly but I have one bulb holder that has two wires connected - earth & live feed.
What is this bulb for - all others have a single wire and are obviously earthed from the body of the cluster.
Does it supply the earth for all bulbs?


It a 59 with the large round speedo cluster..

Have googled but can't find a definitive answer
 
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