How to find the problem with 97 Chevy Blazer S10 20 amp courtesy-light fuse blowing, which controls horn and rear wiper and interior lights and electric mirrors?

Just wondered if anyone else had had this problem, before I go pulling everything apart.

 

Try putting a 25 amp fuse or maybe a 30 it will be risky.

 

Thanks - Tried that already, and no luck.

 

I would NEVER recommend putting a higher amperage fuse in place of the stock sized fuse. That could lead to a fire in your vehicle due to allowing more current to flow before the fuse would blow. Most likely, you've got a pinched wire that is grounding out. More amperage = more heat.

When you do dig into this (and you probably will have to), you'll have to inspect ALL of the circuits affected. To rule out some of them, you can for instance disconnect the horn and test the positive terminal on the connector for continuity to ground (with the fuse out). Then move on to other systems on the circuit and repeat until you find the source of the short. It won't be fun, but I do hope that you get it corrected!

 

Can you explain for me how this is done?
Thanks,
Russ

 

Do you know how to use a multi-meter? Most multimeters have a continuity test mode. Touch the probes together and the MM will give an audible tone.