Stancor relay 586-902 vs OEM GPR warning........Maybe??
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Stancor relay 586-902 vs OEM GPR warning........Maybe??
IMO you need to be careful with the larger Stancor relay, it may melt the GP's if you treat your rig like me....ie. drive away with the GPR still active or use the AIC for warming the engine.
FSM quote:
Verify this by increasing the engine RPM w/the GPR active....watch the battery voltage dip up and down....or the head lights go bright and dim. This is the GPR being switched on/off by the PCM.
This does not happen with the STANCOR relay #586-902 no matter how high you rev it.
Anyone else notice this?? or did I screw up....again haha
FSM quote:
The powertrain control module protects the glow plugs by energizing them for short durations if the battery voltage is abnormally high.
This does not happen with the STANCOR relay #586-902 no matter how high you rev it.
Anyone else notice this?? or did I screw up....again haha
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I agree. A relay is a relay. If the pcm is switching on and off the stock one it would be switching on and off the stancor as well. I dont understand how the pcm knows how much voltage the gps are using because I don't think there is feedback from the glow plugs to the pcm at least nothing I know of?
Maybe your alt is starting to go bad? Or your stock gpr had a bad contact inside?
Maybe your alt is starting to go bad? Or your stock gpr had a bad contact inside?
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Jim, it's possible if the PCM is monitoring current draw through the GPR coil. Different relays would have different coil resistances thus different current draw. It would be interesting if you could measure the actual coil resistance on the "Stancor" relay and compare that to OEM coil resistance.
In any case, good observation.
In any case, good observation.
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Jim, it's possible if the PCM is monitoring current draw through the GPR coil. Different relays would have different coil resistances thus different current draw. It would be interesting if you could measure the actual coil resistance on the "Stancor" relay and compare that to OEM coil resistance.
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Jim makes an excellent point. Granted a relay is a relay. Either works or not. But the efficiency of different relays is the question. I am of the impression that the PCM sends ground to the relay until oil temps reach a certain level. That may not be correct but that is my assumption. Like the IDI engines and coolant temperature.
If you fired up and went to high idle immediately I can see the higher voltages coming into play. Even though for a very short time.
Gonna have to do some more thinking on this one.
If you fired up and went to high idle immediately I can see the higher voltages coming into play. Even though for a very short time.
Gonna have to do some more thinking on this one.
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Actually, it's a good design practice to monitor the voltage/current at the device you want to control. Stancor web site indicates it is rated at 12volts @ 8 watts. A little math indicates the relay coil resistance is about 18 ohms.
@ 18 ohms and 11 volts current = .61 amps
@ 18 ohms and 14 volts current = .77 amps
If OEM relay was 15 ohms (don't know, again just speculating) then ...
@ 15 ohms and 11 volts current = .73 amps
@ 15 ohms and 14 volts current = .93 amps.
If - when it stops raining hard I'll go out and measure my OEM GPR coil resistance.
@ 18 ohms and 11 volts current = .61 amps
@ 18 ohms and 14 volts current = .77 amps
If OEM relay was 15 ohms (don't know, again just speculating) then ...
@ 15 ohms and 11 volts current = .73 amps
@ 15 ohms and 14 volts current = .93 amps.
If - when it stops raining hard I'll go out and measure my OEM GPR coil resistance.
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I dont have mine shut on and off, but when the Relay is on, oh man does it pull on the alternator.
Winshield wipers are useless if the GP's are on in my truck too. They go at the speed of slow, even if i'm driving and the GP's are on, they still don't function right till the GPR turns off.
I've never had mine turn off and on.
And far as my knowledge goes, relay is a relay.
But Jim's got the right idea up above us here.
I'd go out and measure my old GPR, its still .... no wait, I just took it to the scrap yard. It was bad anyways.
Thanks for a good topic of Discussion Jim.
Winshield wipers are useless if the GP's are on in my truck too. They go at the speed of slow, even if i'm driving and the GP's are on, they still don't function right till the GPR turns off.
I've never had mine turn off and on.
And far as my knowledge goes, relay is a relay.
But Jim's got the right idea up above us here.
I'd go out and measure my old GPR, its still .... no wait, I just took it to the scrap yard. It was bad anyways.
Thanks for a good topic of Discussion Jim.
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Good stuff guys.....I think Hussler has it right (cali model)......That darn shunt never made sense to me. Electrical ain't my strong suit....can you tell haha
Every PSD I've ever seen will turn off the GPR when you rev the engine.......just like the quote from the FSM above. FYI: The dual alternator models deactivates one of the alternators when the GPR is on, most likely for the same reason.
For now, I'm just letting the engine idle until the GPR goes off. No need to drop a GP tip into the cylinder.....
EDIT: I found this in the FSM about the cali engine.
DTC P1395 or P1396 will set on the bank that is reading less than 39 amps.
Does this mean the PCM monitors the amp draw vs voltage??
Every PSD I've ever seen will turn off the GPR when you rev the engine.......just like the quote from the FSM above. FYI: The dual alternator models deactivates one of the alternators when the GPR is on, most likely for the same reason.
For now, I'm just letting the engine idle until the GPR goes off. No need to drop a GP tip into the cylinder.....
EDIT: I found this in the FSM about the cali engine.
DTC P1395 or P1396 will set on the bank that is reading less than 39 amps.
Does this mean the PCM monitors the amp draw vs voltage??
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