I have a 1980 300TD and it is continually blowing the #3 fuse. The one for the passenger side marker lights and the dash lights. Any ideas on the easiest way to trouble shoot this? When I put in a new fuse its good for about 2 minutes and then it begins to melt and finally pops.

I don't know what number 3 protects - what does it say on the back of the fuse box cover? There is often a card with what's what written on it.

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Hi-
The rule when troubleshooting electrical issues is always check for good Ground connections. There are several ground points on these (and any) cars. Instead of trying to find them all to see if they are o.k. do what I always do with older cars- ad a couple Grounds to the system. I've added (4) 8ga. wires to my '83 w123 300d. They are 'starred' from the Ground at the battery to: 1. dashboard ground point (behind instrument cluster); 2. transmission bell housing; 3. rear fender (behind tail light); 4. front fender (behind head light).
My lights are bright as can be and I don't blow bulbs or fuses since this fix. I did have random fuse issues before this though. Hope this helps.
Good Luck!
Chris

Thanks. I've considered doing this.

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My occupational hazard bein'
my occupation's just not around...
1980 300SD
1980 300SD