Just pull the plug to the plugs, put meter on ohms, put one end in the
plug, other end to the engine or some other ground. Should be something
around .8 ohms IIRC, if it reads open its bad if it reads a high number
like over about 1.5 its bad. Do this for each contact on the relay end
of the glow plug harness.
On 11/30/2015 5:39 PM, Greg Fiorentino via Mercedes wrote:
IIRC the plugs can be tested easily from the relay contacts. I vaguely
recall that there is also a simple test for the relay?
I had good success with only replacing plugs that tested bad. The effort of
replacing plugs is per plug, so no real advantage to doing all at once. IME
other plugs do not necessarily fail very soon after the bad ones.
Greg
-----Original Message-----
From: Mercedes [mailto:[email protected]] On Behalf Of Meade
Dillon via Mercedes
Sent: Monday, November 30, 2015 12:59 PM
To: Mercedes Discussion List
Cc: Meade Dillon
Subject: Re: [MBZ] W123 glow circuit
Methinks you have a bad glow plug or two, test the plugs.
Noise: alternator noise will be reproducible with no forward motion but
increase engine RPM.
-------------
Max
Charleston SC
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