PeachParts Mercedes-Benz Forum - Where's the fuse for my glow plugs?

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jbach36; I have a 92 300SD and I have the same box. There is no visual fuse, is an internal relay due to the fact of afterglow feature. System the activates on cold weather. Glowplugs need full battery charge or they will not came on. Check dieselgiant.com for trouble shooting procedures, you will need a multimeter tester. (skip the step of the fuse). Good luck Victor vmcastillo@verizon.net

Quote:

Originally Posted by sixto (Post 2061652)

The ETM diagram in my copy of the 124 FSM on CD shows an 80 amp fuse in the 86-90 relay and no fuse in the from 91 relay. It doesn't show a circuit breaker as a discrete device. The controller device has a relay function that sets a switch between the power source and the glow plugs. Anyone's call how representative the ETM diagram is.

I've heard of aftermarket replacement 2.5 relays with strip fuses. I don't know of anyone with a dealer replacement relay. Maybe Phil can settle this.

Sixto
87 300D

thats what im seeing

basstrip you have w140 which didnt have the fuse

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I know it's old but same year same part... glow plug relay 95 E300D

Haven't been online for a few weeks now, getting ready to move to Kentucky. Yesterday a problem popped up and never went away.

No fuse on my relay either.

Yesterday, typically starting cold, glow plug dash light would come on and stay on after starting.

Sometimes it would not come on, but it would still start.

Read a while on the internet & decided to follow a few of the suggestions.

Found glow plug four failed resistance test.

Last thing I did was pull the glow plug relay, take it apart and clean contacts thoroughly with both alcohol and contact cleaner sprayed on thin paper.

Put it back together, added a mickey mouse led, and tried a cold start.
Dash light came on, dash light went out, I started the car.

Dash light went out. I checked outside and the LED was bright red.

I watched for about two minutes and it went out.

Checked inside and the dash light was back on. Checked LED again and it was still off. LED shows me the glow plugs are heating or not.

I'll update in a few days once I learn more.

When one plug is bad, you won’t get the preglow light when you start. Once the engine is running, the light comes on and doesn’t go out. Now you know the secret code, replace your plug and be happy.

The light is not consistent.

Sometimes, when cold, it comes on like normal and goes off after a little while, then comes back on and stays on.

Other times, when cold, it does not light but starts easily. After a while light comes on and stays on.

Hopefully the glow plug relay is ok, time will tell, probably won't attempt #4 glow plug change until sometime this winter in central Kentucky. At least the glow plugs aren't heating all the time.

Thanks for your comment.