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Because they are melting the fuseable link, the difference is not very significant. Many of the fuse packages actually say 12 or 24v...

The fuses work fine, I keep a few of the breakers as they are handy when troubleshooting intermittent short circuits...

Cool!

Well if you cannot turn on the lights, start with CB70. In addition to feeding power to the main switch to power the K2 relay, it also feeds power to the lightswitch.... standard 12v automotive fuses will be fine For both the 12 and 24v circuits...

Oh, and the breakers seem a little fragile to me. I kept a few for testing/troubleshooting, but replaced them all with standard automotive blade fuses. Way more predictable, especially when you add in vibration...

Voltage check at power panel test points = good. Not testing While under load = bad... gotta test when loaded(switch turned on) or they don’t count. what year truck? when you turn on the Main switch, it energizes the instrunment power relay K2 In the PDP. I would start there. 12v flows...