GPR LED Light

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Nov 2, 2012 | 01:41 PM

#31

SpringerPop

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From: La La Land

Though I suspect the PCMs outputs are indeed open-collector, paralleling them would defeat the purpose of monitoring the GPRs output voltage. If you did that, the possibility is there of a faulty GPR still illuminating the WTS, and defeats the real purpose.

I like your thinking of using an NPN to reverse the logic. That would simplify things a bit.

I suspect a 2N2222 and a 1K would do the job nicely, but I'd have to do the math to be sure, and I don't know the bulb's current draw.

Pop

Nov 2, 2012 | 03:06 PM

#32

KelVarnson

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Joined: Feb 2007

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Quote:

Originally Posted by SpringerPop

I'm not sure I understand what you mean here. A faulty GPR would mean that the WTS light would not light (at least after the normal WTS cycle timed out).

Quote:

Originally Posted by SpringerPop

I like your thinking of using an NPN to reverse the logic. That would simplify things a bit.

I suspect a 2N2222 and a 1K would do the job nicely, but I'd have to do the math to be sure, and I don't know the bulb's current draw.

Pop

Yep, 1K would give plenty of base current, I think you could even use 10K. LED's are typically 20 or 30 milliamps. I think 2222's have a minimum beta of 100.

If you used an N-channel MOSFET, you could eliminate the resistor. My only concern might be voltage spikes caused by starting or other load dumps. Might need a diode or two for protection.

Nov 2, 2012 | 05:18 PM

#33

SpringerPop

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From: La La Land

Quote:

Originally Posted by KelVarnson

I'm not sure I understand what you mean here. A faulty GPR would mean that the WTS light would not light (at least after the normal WTS cycle timed out).

Wired the way that you suggest (OR'd together) if you were relying on the WTS light to indicate GPR current, you would have an initial erroneous indication (for some appreciable time) when the GPR is failed.

I would simply show the status of GPR output, and forget about OR'ing the two signals.

Pop

Nov 2, 2012 | 09:53 PM

#34

KelVarnson

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Got it, thanks.

Nov 15, 2012 | 12:12 PM

#35

E55 Bulldog

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Where are you guys running this through the firewall into the cab from?

I don't have guage cluster in my truck so I can't follow thoes wires.

Thanks

Nov 15, 2012 | 04:21 PM

#36

SpringerPop

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From: La La Land

Through one of the "firewall pass-through" wires.

If you've got a SuperDuty (this IS a forum for SuperDutys), you've got those.

Pop

Nov 15, 2012 | 04:43 PM

#37

E55 Bulldog

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I have a 97 obs

Nov 15, 2012 | 06:57 PM

#38

SpringerPop

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Joined: Jan 2002

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From: La La Land

Drill, rubber grommet, RTV sealant.

Waa-laa!

Pop

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Nov 15, 2012 | 07:53 PM

#39

nlemerise

Logistics Pro

Joined: Jun 2005

Posts: 4,243

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From: AZ

Quote:

Originally Posted by MTDewX

I am curious where you guys get the 1 amp fuse. sounds funny and I laugh at my self too. but I can't seem to find them. been to local auto stores and nothing.

PM me your address and I will mail you a couple...I use lots of them in stereo restoration work.