1989 300E 120k M103 engine

No. 6 fuse blows intermittently without any pattern. Fuse is for horn, turn signals and outside temperature gauge. Inspected/cleaned all bulb holders, wiring, and fuse holder with no luck. Any ideas?

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1989 300E

2005 Acura TL

2011 Hyundai Elantra Limited

Swing hard! Take chances!