I would add that most FLAPS will also test the starting/charging system for free as well.
-D > On Jan 24, 2019, at 4:09 PM, Meade Dillon via Mercedes > <mercedes@okiebenz.com> wrote: > > The OP has shared offlist that the pre-glow relay was replaced back in > December IIRC. > > At this point, however, given the number of less-than-qualified hands that > have been working on the car, I think it would be prudent to go back to a > thought shared earlier and assume nothing, start with fresh diagnosis. > Curt is right on this one, stop making assumptions and test / inspect > everything. > > Replace the serpentine belt, ensure the tension device is working > correctly. Ensure the belt is routed correctly - check the owner's manual > (? is the picture there?) for a picture of how it is supposed to be > routed. I've attached a picture to this post. > > Battery, even though new, needs to be load tested. Free at FLAPS. > > Start the car, measure voltage at battery terminals. If less than 13.5 > volts, determine cause. Note that this car should have after-glow feature > in glow plug relay, so wait at least a minute or two after start up to test > the voltage. Cause of low voltage could be bad alternator or bad harness > including the connector at the alternator. > > Check cables from battery to starter and from battery to ground; corrosion > can reduce current to the point of no-start. > > Check starter for tight battery cable connection (the big thick one). > > Check ground strap between engine bottom and body of car. > > Intermittent fault in glow plug relay draining the battery: make a > semi-permanent installation of a test light at a glow plug connection, so > the light is visible while driving the car, and if it lights up when it > shouldn't be lighting up, then you've got a bad pre-glow relay. > > Check for parasitic draw as discussed ad nausea, with some test at the > battery. > > If the glow plug relay is good, alternator is good, battery is good, cables > / harnesses are good, another possibility is a weak starter. > > ------------- > Max > Charleston SC > > > On Thu, Jan 24, 2019 at 1:49 PM Curt Raymond via Mercedes < > mercedes@okiebenz.com> wrote: > >> I was thinking that if you left your test light on for a few minutes you >> could get past that bootup stage. >> Do you think if you used a fairly large bulb you could use brightness as >> an indicator of draw? >> If our primary thought is that the glow plug relay is at fault that would >> be a pretty hefty draw. >> >> >> > <OM60x pulley layout and length.jpg>_______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
