Glow plug relay voltage

[arrowstrap]

Stroker, could you verify this is the right part? it looks as if the mount is in a diffrent location. does this GPR need to be mounted on it's side? thanks.

Stancor / White-Rodgers - 586-902 - Allied Electronics

 

[DOC-MX]

I got these mumbers:
(Allied Electronics) 576-1078 (Stancor Heavy Duty 586-902)
(AutoZone) MR99
(Ford) F7TZ-12B533-CA (94-96 with pigtail)
(Ford) F81Z-12B533-AC (96-early 2000 w/o pigtail)
(International) 1807230C2
(International) 1826634C94
(Napa) GPR-109
-popcorn

 

[95_stroker]

Stroker, could you verify this is the right part? it looks as if the mount is in a diffrent location. does this GPR need to be mounted on it's side? thanks.

Stancor / White-Rodgers - 586-902 - Allied Electronics

That is correct, its mount is a little different but it will mount and the engine cover still fits perfecty.

 

[arrowstrap]

OK, i replaced the relay with the heavy duty allied... however when i key on there is still a VERY strong smell of burning plastic for a few minuites.

any other ideas?

currently i have the GPR harnes unplugged to keep the GP's from kicking on at all. i've no idea where to look from here. using the meter i get a constant 12 volts to one of the large posts on the relay with key on/off. key on, i get 12 volts to both posts till the GP time out.

the boot that covers one of the large post wires is melted as well as part of the wire where it connects to the terminal. this is the eye terminal that has the two brown wires going to it. when i felt the new relay, nothing was hot to the touch as the old one was.

where to look for resolution????????????

all new motorcraft plugs.

 

[Tbar]

i get a constant 12 volts to one of the large posts on the relay with key on/off. key on, i get 12 volts to both posts till the GP time out.

Key off.....you should have voltage to the large stud on the battery side of the relay and not the other. No voltage to either small terminals.

Key on/Glow Plugs on........you should have voltage on both large relay posts as current is passing through the relay to the GP's. You should also see voltage on both small terminals s as low amperage current is being sent through them to pull in the contacts allowing high amperage current to pass through the relay to the glow plugs.

When the GP's cycle off(key on) you should only see voltage on the one large terminal on the battery side.

the boot that covers one of the large post wires is melted as well as part of the wire where it connects to the terminal.

Prehaps the old relay had partially burnt contacts creating high resistance. That might have burnt the wire and the terminal cover you are discribing and thus the smell.

Does the burnt wire get hot now................???


Tbar


on edit:

......is melted as well as part of the wire where it connects to the terminal.

If you have a partially melted wire it is probably creating high resistance/heat and is continuing to melt the wire insulation. You better check this and R&R asap.

.

 

[arrowstrap]

Tbar, my relay voltage stages are exactly as you discribed they should be.

The old relay had a few rusted contacts. i have repaired these when replacing the relay.

To my knowledge, the burnt wire is not exposing any wire. it apears the sheathing had heated once and it began to slide.

i will reinspect the wiring and make sure there is not a direct short.

 

[Tbar]

Tbar, my relay voltage stages are exactly as you discribed they should be.

The old relay had a few rusted contacts. i have repaired these when replacing the relay.

To my knowledge, the burnt wire is not exposing any wire. it apears the sheathing had heated once and it began to slide.

i will reinspect the wiring and make sure there is not a direct short.

Your not necessarly looking for a direct short. The wire is made up of strands.........if some of these strands have melted the wire doesnt carry enough amperage and the partial break creates resistance/heat which further melts the insulation.

Just a thought. Maybe someone else has some ideas.


Tbar

 

[DOC-MX]

Your not necessarly looking for a direct short. The wire is made up of strands.........if some of these strands have melted the wire doesnt carry enough amperage and the partial break creates resistance/heat which further melts the insulation.

Just a thought. Maybe someone else has some ideas.


Tbar

DITTO. better change the wire. my 0.02