Quote:
Originally Posted by Stevo
A good friend called with a "85"SD question. The GPs stay on for +- 2.5 minutes after the car starts and the alternator wont keep up with the draw resulting in a dead battery. his wife is running around doing errands in town and the battery will soon be dead with all the stopping and starting. The GPs shouldn't stay on for that long after the car starts, right?? Bad GP relay?  |
Something else is not right. 5 glow plugs once it reaches highest temp draws about 40 amps. The 85 SD has at least a 65 amp alternator and should keep up. Maybe it has a weak battery or weak alternator. If the glow plugs do indeed stay on for 2.5 minutes everytime the car is started and it is used for short trips then the battery may get weaker and weaker.
A solution is go manual. I have ones that are plug and play where the glow plugs are never on unless you push the button. Perfect for lot's of shot trips.
http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/359811-sale-manual-mercedes-glow-plug-controller-w123-300d-240d.html