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CJ fuel low lights

 
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keithmckinley



Joined: 11 Aug 2008
Posts: 434

PostPosted: Sat Apr 25, 2015 3:43 pm    Post subject: CJ fuel low lights Reply with quote

I have a scratchy schematic but can anyone tell me the mechanism by which the low fuel lights trigger on the CJ through the transmitter. I seem to have a bad ground in the circuit but it's strange it would be occurring on both tanks apparently simultaneously. Especially since I see a separate ground for each sending unit. Anyway, with under 10L in each tank I'm not getting any lights. positive power to lights is there and they test when I intentionally ground them.

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pfstelwagon(at)earthlink.
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PostPosted: Sat Apr 25, 2015 4:34 pm    Post subject: CJ fuel low lights Reply with quote

Where do you apply the ground when you test them? These aircraft are
getting old and corrosion is sneaking in, you may be seeing a poor ground
condition between the outer wing where the switch in the tank unit is
located and the center structure. Incidentally I got my schematic from Doug
Sapp, excellent quality.

Frank
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clouddog22(at)gmail.com
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PostPosted: Sat Apr 25, 2015 6:20 pm    Post subject: CJ fuel low lights Reply with quote

Frank, any chance you could send a copy of the schematic to me
Email is clouddog22(at)gmail.com (clouddog22(at)gmail.com) thanks. Greg, On Apr 25, 2015 7:37 PM, "Frank Stelwagon" <pfstelwagon(at)earthlink.net (pfstelwagon(at)earthlink.net)> wrote:[quote]--> Yak-List message posted by: "Frank Stelwagon" <pfstelwagon(at)earthlink.net (pfstelwagon(at)earthlink.net)>

Where do you apply the ground when you test them?  These aircraft are getting  old and corrosion is sneaking in, you may be seeing a poor ground condition between the outer wing where the switch in the tank unit is located and the center structure.  Incidentally I got my schematic from Doug Sapp, excellent quality.

Frank
---


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keithmckinley



Joined: 11 Aug 2008
Posts: 434

PostPosted: Sun Apr 26, 2015 6:08 am    Post subject: Re: CJ fuel low lights Reply with quote

when I tested to ground I did it right at the bulb socket and the frame. Anyone know where the ground for the Fuel level transmitter initiates?

Also, is it a pain to pull the transmitter to bench check it?

I'll contact Doug to purchase his...Thx


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pfstelwagon(at)earthlink.
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PostPosted: Sun Apr 26, 2015 8:58 am    Post subject: CJ fuel low lights Reply with quote

Per the schematic there is a connector or terminal block in the route to the
sensor. Pull the wing straps and look at the wiring that crosses the gap.
The final ground point is at the sensor per the schematic.

Frank
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keithmckinley



Joined: 11 Aug 2008
Posts: 434

PostPosted: Sun Apr 26, 2015 9:12 am    Post subject: Re: CJ fuel low lights Reply with quote

Thanks Frank. I think I may pull out a transmitter and check it if I can;t find the ground. I seems there is a separate switch that triggers the lights..

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wlannon(at)shaw.ca
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PostPosted: Sun Apr 26, 2015 9:46 am    Post subject: CJ fuel low lights Reply with quote

Hi Keith:

The switch in the fuel sender unit enables a ground circuit in each side
(wire # -14Y3 & - 15Y3 , L & R). Very surprising that both sides are
affected. I can"t recall right now exactly where those wires go to ground
but possibly at the wing joint? In any case seems highly unlikely for
both sides to fail concurrently! Possible it's not a ground problem but
that power to wires 14Y4 and 15Y4 has been lost at a common source.

Walt
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keithmckinley



Joined: 11 Aug 2008
Posts: 434

PostPosted: Sun Apr 26, 2015 1:32 pm    Post subject: Re: CJ fuel low lights Reply with quote

Thanks Walt,

The front left light light distributes the power from the bus and it checks out as well as all the lights downstream. I did probably misspeak though because I only check these lights during an annual if I happen to be low enough on fuel to make it worth while to drain the fuel down to get them to work. Otherwise I never get anywhere near the level to trigger them (well 90% of the time). Since both sides are inop I'll likely have to pull at least one transmitter. That won't happen for a bit so if anyone has any ideas in the meantime......

Keith


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keithmckinley



Joined: 11 Aug 2008
Posts: 434

PostPosted: Sun Apr 26, 2015 1:39 pm    Post subject: Re: CJ fuel low lights Reply with quote

On second look....even though my schematic looks like it was done in crayon, it looks like I could pull off the cannon plug and ground the #4 pin and see if I get lights and also see if I get anything on the meter taking the #3 pin to ground...

Cheers
Keith


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Ttail



Joined: 24 Jun 2013
Posts: 120

PostPosted: Sun Apr 26, 2015 6:58 pm    Post subject: Re: CJ fuel low lights Reply with quote

Interesting I have the same issue with my CJ both lights are inop.

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mark.bitterlich(at)navy.m
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PostPosted: Mon Apr 27, 2015 5:32 am    Post subject: CJ fuel low lights Reply with quote

Betcha a nickel Doug Sapp might have another.

Hey... Just a thought.

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gill.g(at)gpimail.com
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PostPosted: Mon Apr 27, 2015 10:28 am    Post subject: CJ fuel low lights Reply with quote

Low fuel lights are powered directly from the instrument switch. Front and
rear cockpit lights are paralleled and are ground at low fuel level by a
switch on the tank float level. So grounding is done independently in each
wing, so it seems unlikely that grounding is an issue. I would check to see
if you have power to the lights with instruments powered up.

Gill

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keithmckinley



Joined: 11 Aug 2008
Posts: 434

PostPosted: Mon Apr 27, 2015 12:39 pm    Post subject: Re: CJ fuel low lights Reply with quote

This thread has come full circle.

In the previous posts I explained I have power to all 4 lights. They test good to ground. I believe, it will be an easy check pulling the cannon plug to determine whether the issue is in the sender itself or a bad ground through the sender

I'll post what I find.

Again thanks for the comments all

K


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