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| | | | Joined: Aug 2005 Posts: 424 Shop Shark | | Shop Shark Joined: Aug 2005 Posts: 424 | I just bought another set of gauges for my '58 GMC. The gauges are purportedly from a '56. I notice that on the back of the fuel and temperature gauge are what look like factory resistors or voltage reducers. I don't remember seeing these on my '58 gauges. Anybody know what the story is? | | | | | Joined: Aug 2000 Posts: 346 Shop Shark | | Shop Shark Joined: Aug 2000 Posts: 346 | '55 for sure and maybe '56? GMC small trucks were still 6V.
On the bigger trucks, that were 12V systems, the factory used the same 6v gauges by installing the resistors.
I was surprised when I got my '55 GMC home and discovered it had been (poorly) converted to 12V.
Last edited by OlBlue; 09/30/2009 2:36 PM.
'38 Chevy 1-1/2 ton
'49 Chevy 1/2 ton
'54 Chevy 6400 2 ton
'55.2 GMC 3/4 ton
'56 GMC 1-ton
No Room Left in Shop
| | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | According to books, 55 was 12 volt, but every one I have ever seen is still 6 volt except for some of the larger trucks. And yes the factory put resistors on the first 12 volt gauges. I have a 58-59 parts truck. I can look at the back of the gauges. But the ones with the resistors will work for 12 volts. | | |
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