| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,096 Posts1,056,473 Members48,444 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Oct 2006 Posts: 163 Shop Shark | | Shop Shark Joined: Oct 2006 Posts: 163 | I have a few questions on my gauges and reducing the voltage to 6v. 1946 GMC
Do I need to reduce the voltage on the wire coming from the starter going to my my amp gauge? I don't think so, mainly because that is the primary power feed for everything else. But then will my amp gauge read correct?
I have a power wire coming off the ignition switch that goes to my temp gauge that pig tails up to my gas gauge. I was thinking I would reduce the wire coming into my temp gauge to 6v and then the loop that goes up to my gas gauge will be 6v. Anyone see a problem with that. | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | The amp gauge will be OK unless you use a high powered alternator. The best thing for the gauges is the Runtz resister. It needs one for each electrical gauge. I thought the temp gauge was a capilary tube. The Runtz is available at most specialty stores.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Feb 2006 Posts: 1,867 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 1,867 | GMC used electric temp gauges through some years. They will not work with the Runtz resistor. I havent tried it without the resistor yet and the 6 volt sending units are nearly impossible to find to accurately match the GMC gauges.
That just leaves one needed for the gas gauge.
Amps are amps regardless of voltage. It could be 1 volt or 100 and it wouldn't affect the amperage.
Jeff | | | | | Joined: Nov 2012 Posts: 138 'Bolter | | 'Bolter Joined: Nov 2012 Posts: 138 | Why will the GMC temperature gauge not work with a runtz resistor? What's the diff in principle between the way the fuel gauge and temperature gauge works? Thanks for the info.
David | | | | | Joined: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | What most people don't know is that a 6 volt Zener Diode is all that is needed on the gauges. One for each. Cost is about .89 cents (or less). Face the Silver Stripe away from the gauge and you are good to go. Do not do this for anything but the gauges.
That is what this is:
http://www.ebay.com/itm/Dash-Gauge-Voltage-Reducer-12-6-Volt-Runtz-Diode-to-resistor-b-/291161623894?hash=item43ca95cd56:g:wM4AAOSwfcVUEzHN&vxp=mtr | | |
|
|
| |
