Can you hear or feel the relay click when the ignition switch is turned on? It sounds from all the symptoms like the mechanical relay is bad. Or maybe be there isn’t enough current to actually activate the relay? You could still see volts but not current. Did you try running power directly to the relay off the battery, bypass the ignition switch?
--FT Sent from iFōn > On May 12, 2023, at 8:04 PM, Dimitri Seretakis via Mercedes > <mercedes@okiebenz.com> wrote: > > Ok so in addition to the wire that goes to the relay power lug, there is a > second harness going to the relay which is comprised of 5 wires going into a > connector. One of these is purple with white stripe. One of these 5 wires, > not sure which without taking connector apart, is live only when ignition is > in on position. I’m guessing, therefore, that there is signal from key > switch? So I’m guessing that if there is power to the relay and there is > signal from the key switch but there is no power output from the relay at the > five pins that go to the corresponding glow plugs that the relay is bad. But > this is a new relay. I realize that a new relay could also be defective but I > just don’t buy it. What could be going on here? > > Sent from my iPhone > >> On May 12, 2023, at 5:47 PM, Dimitri Seretakis <dsereta...@yahoo.com> wrote: >> I’m not sure how to check for that. There is constant power at the lug on >> the relay. With the ignition in the on position there is no power at any of >> the 5 pins on the relay that go to their respective glow plugs. >> I inspected the chaffed harness and while there are some exposed wires where >> the insulation has rubbed off, the wires appear to be intact and not >> obviously shorting on anything. >> I’m at a loss here. >> >> Sent from my iPhone >> >>>> On May 12, 2023, at 12:43 AM, Jim Cathey via Mercedes >>>> <mercedes@okiebenz.com> wrote: >>> >>> The signal from the keyswitch should be there at the relay. If it's not, >>> of course it won't work. Used to be the purple wire, IIRC. >>> >>> -- Jim >>> >>> >>> _______________________________________ >>> 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 > _______________________________________ 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
