Cigarette Lighter and Blower Relay Wiring Questions

[HO455]

The nature of fuseable links is that they are a slow blow type of fuse. Meaning that if it is rated for 30 amps once exposed to 35 amps it may take as long as a minute to blow where a fuse would blow in a matter of seconds.

In your case both the fuseable link and the wiring at the fuse block were heating up simultaneously. You were only able to smell the wires in the cab.

I would recommend doing a physical inspection of the fuseable link by bending or flexing the fuseable link looking for stiff or ridged areas. When a fuseable link fails it shouldn't show any signs of overheating. So flexing and stretching the link should allow you to detect any melting of the conductors inside.

Another possibility is that someone in the past replaced the factory fuseable link with an incorrect wire that doesn't protect the harness.

I posted some information on fuseable links in post 469 in the link

http://67-72chevytrucks.com/vboard/s...or#post8564169