glass fuses in the size you are using don't have color codes. the size is stamped into one or both of the end metal barrels on the side. they will have the voltage and current stamped there; like 12V 10A or 32V 10A, etc. with a prefix like AGC (type) or something. the only inline glass fuseholder that I see in Tractor Supply online is 30 amps. you should be able to get a box of 4 or 5 replacement fuses for a few bucks. if you have the old fuse, you can take it just about anywhere that sells automotive parts and get replacements. you will have to match the length, diameter and of course voltage and current.
Repeatedly and quickly turning something electrical on and off causes what is called 'inrush current'. inrush current is 5 to 7 times the normal running current of a load and will blow fuses quickly without a short or other flaws being present if you turn something on and off like you are doing. allow a few seconds between on/off cycles to prevent this. lights don't have as much inrush as other loads but they still have some.
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