just replaced my GPR with a GPR-109 from napa. Wanted to get a stancor but couldn't wait. Truck wouldn't start this morning.

Wired it all up and when I clicked the key on something started humming. Seeing as how the old relay didn't work this could be two things, the relay coil itself or the glow plugs. Do glow plugs make a humming noise?

If this were a 120v circuit I would describe the hum as somthing similar to a 60hz hum but slightly higher in pitch.

Is this normal??? It sure doesn't sound normal. If this is defective, you think Napa will replace it for me?

Glow plugs definately work though. Truck fired right up

 

same situation here i put the gpr 109 in about a month ago and everything still works fine. i am not too worried about it, it at least works and for the 30 dollars i paid it beats having to drive to car on those cold mornings.

 

My 109 doesn't make any noise .. May want to check all the connections again ...

 

X2
Low batt voltage will also chatter the relay.

Bill

 

The 110 I got does that to. It will either fail or not. Keep an eye on it. I only noticed it once. But it's only been in about five days.

 

A friend of mine had the same problem with a 109. He returned it & got a new one & the buzz went away.

 

just opened my hood this morning and turned the key went and listened. the noise is gone. break in? i don't know but it still works about a month later.

 

Well I check mine yesterday and it still buzzes. Bummer. Well back to Napa!

 

If I'm guessing correctly, its a coil basically?
If the wires not wrapped well, they will humm like a transformer.

 

There has to be more going on. A lose coil will hum on AC. With DC lose wires will click once and then be quiet. Something is causing oscillation. Maybe if the coil is borderline on staying... it will turn on the plugs; the voltage drops and it kicks back out; and then repeats.