Apart from the ABS light, the rest of the symptoms you’ve experienced were nearly identical to mine before I replaced my OVP relay. Once replaced (alongside new Bosch glow plugs), I never had a similar problem since.
Had all sorts of issues. The glow plug circuit is extremely finicky.
Replaced glow plugs with matched Bosch plugs and replaced glow plug bus bar with 10 gauge wire, checked all plug currents with a DC current clamp to ensure they were all drawing the specified amperage.
I replaced the glow plugs and that solved the issue she has been firing right up for a few weeks now!
From what I understand the afterglow on the Duraterms works because they self regulate voltage per each plug, not allowing them to burn out. It virtually eliminated rough idle on the cold start.
I have installed these in my 81 and they work very well. Start it up and let the plugs sit on for an additional 30-45 seconds.. pretty much does away with the rough cold starts.
As far as glow plugs, I would consider the following to be the better ones on the market: Bosch Beru Monark NGK
Just a cautionary note for whatever you want to do with it. These will likely not be Bosch quality; could be Vespark from Taiwan or something from China.
Two months ago I changed all the glow plugs with Bosch plugs. The glow system works great.
As for the correct plug, I got a set of bosch plugs for it - the part number was the same as the ones I took out, so I am assuming this is the correct plug.
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The brand is registered in Germany.
In March 2026, PartReview has a mixed opinion of Bosch glow plug. PR Score — 83 out of 100, based on 10 reviews and 31 vote. 8 positive reviews, 1 neutral review, 1 negative review. Average rating — 4 (out of 5). Votes: 26 up, 5 down.
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