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The suburban furnace in my 94 Warrior worked okay in late April this year, just more fan noise than I would like. But in late July it was dead. No fan, no clicks, fuse in 12v converter was okay. Our next trip is to Michigan's upper peninsula right after Labor Day; forecast is for 60's high, mid 40's to low 50's at night. So I went on a voltage hunt. I found a buss glass fuse in the red feed wire on the side of the furnace had blown. 4 amp was hard to find. Struck out at NAPA. Auto Zone had one only if you bought a nine fuse assortment for 3.99. Found them at a hardware associated with the do-it-best chain. A 4-pack of 4 amp fuses was 1.99 but then I saw a 2-pack of time-delay 4 amp fuses for 4.19. Since I could not think of a reason for an overamperage I was concerned that I would keep blowing a regular fuse. I thought it only runs the fan so the time delay fuse seemed a better idea and installed one. Furnace works. Now today I got out the factory manual for the furnace and saw there is a circuit board in there. The question is--could I ruin the circuit board if the voltage goes over 4 again? I have been told that time delay fuses take about 30 seconds to blow. Should I pull out the time delay fuse and put in a standard one?