Glow light coming on while driving: 300SDL

[bhatt]

Hello,

I have an '86 300SDL and the glow plug light has been coming on recently while driving. It comes on for 3 or 4 seconds and has done so twice in the last month. Never did this before. Car now has about 230,000km on it (140k miles)

I have all of the service receipts from the previous owner, so I know the glow plug relay was changed a few years ago. I can't find any receipts for glow plugs, so I can't confirm whether they have ever been changed or not.

Glow plug fuse was replaced 3 months ago, and I did it with the battery still connected. Didn't realize the circuit was live all the time, so when I touched the screwdrive to the screw, the original fuse melted and made a loud pop (pretty cool, actually). Disconnected the battery and continued with fuse replacement. Car has run fine since, so I'm not sure if this is related or not..

Will be testing the glow plugs this weekend with an ohmmeter, but does this sound like I'm ready for a brand new set of plugs?

Thanks!
Neal