[diesel_mercedes] Glow Plug relay

 

I've been having charging issues.  The PO said it was the voltage regulator, he had one on order when I bought the car, so he gave it to me when it came in.  It's a Vemo(NAPA) VR.  I installed it and sure enough I was getting if I remember correctly 14.5V or there abouts, previous to that the battery was at about 12.6.

Fast forward, I've been stranded a couple of times, got a jump from people, so I started bugging out wires.  I just finished starting the car today, the voltage dropped from 12.75 to 12.4v, revved the engine, nothing different.

Pulled the glow plug relay wires (5 pin connector), no change, started pulling the fuses and have the list but essentially with everything out, voltage is 12.6, revving yields nothing more.

Now the fun part, put the fuses back in, back to 12.4V, then the 5 pin connector to the GP relay, drops it to 11.8V.

I think the GP relay must be sticking.

PO also told me he replaced the glow plugs.  I'm wondering if the relay sticks and keeps them on, would it cause the voltage regulator to fail?

Also noticed that without the 5 pin connector installed the temp gauge does not work.  Install the connector and the gauge reads normal.

Before I install an aftermarket relay with a push button switch to bypass the MB relay, I wanted to run my findings by the list.

Thanks,
Bud
http://www.rhinocat.com/cvaf4u/

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