Question about Cars & Trucks
Changed alternator to 80 amp and since cannot get glow plugs to preheat but they do work when key in start position. Light does not come on for preheat but does when starting
See the diagram attached for charging/ignition. and recheck any connection wires for loose, corrode, or open or break wires with VOM. If the problem persist you must RUN the scanner/computer for easy diagnostic and fix it.
God bless you
Posted on Jul 12, 2013
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Posted on Jan 02, 2017
SOURCE: 1999 Yukon cold start problems.
1999 Yukon Start Issue - I have replaced the octopuse, battery, fuel filter, fuel pump, still having problems starting in cold weather, sometimes after a heavy rain.
Posted on Dec 08, 2008
I don't have the solution but a possible help in diagnosing. If you remove the water temperature sensor connector from the sensor, the glow plug light should stay on when you go to start the car. Try leaving it on for 15 seconds and then start the car. If it starts right away, it is your sensor. If it doesn't, the good luck.
The sensor is located on the right side of the engine near the top, at the back. It is in the coolant fitting directly behind the hose from the rad, just left of the thermostat. Be careful to disconnect the wires, and not remove the sensor, or you will loose a lot of coolant. The sensor is held in by a separate plastic clip, and the harness just has a little built in clip on the side. Hope you have small hands...
Posted on Jan 06, 2009
SOURCE: 1997 VW JETTA DIESEL GLOW PLUGS
You have to replace the defective glow plug. You can test the glow plug without the test light. Just put a wire on the bolted end of the glow plug and connect this to the battery (+) terminal. Then, put a wire around the body of the glow plug and connect this to the battery (-) negative terminal. Hold at this position for a minute or less. Good glow plug will heat up.
As far as the wiring schematics, I will just describe
it. Your ignition switch is connected to the positive
terminal of the battery by way of the fuse in the fuse
box. From the switch it goes to a timing relay before
going to the glow plug terminals. The glow plug body
is screw mounted to the engine block which serves
as the negative terminal. So, as you switch your
ignition, it heats up the glow plug enough to give a
combustion of the atomized fuel in the cylinder piston
of your car causing it to run.
Posted on Nov 21, 2009
I am with a similar problem...
After putting on a new sump i found that the starter motor would work cranking the engine but no power is going to the glow plugs. The light on the dash does not appear either.
The relay for the coils does click but that is the end of it. I have a suspission it is the imobiliser but after taking the battery on and off several times to reset... still nothing.
There is fuel, good battery (fully charged), fuel lines are clean pressurised...
Posted on Feb 11, 2010
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