Temp. Gauge Input? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

alta-aj · 03-02-2003, 09:46 PM

I have a 79 400 in my 72 Jimmy. Ever since I installed it, the temp gauge hasn't worked. In fact, I'm not even sure if it worked before the engine changeout occurred.

I took the sender out today and put a flame to it and the resistance decreased from about 3.4K ohms at about 65 deg. as the temp increased. So, seeing I had responsiveness from the sender, I hooked the (dark green) wire from under the hood back up, made sure the sender was grounded, applied the heat again and still, no response at the gauge.

Can anyone tell me what the input to our vintage temp guage is (in case the 79 sender is incompatible) and what the range of the input is?

Any other suggestions as to what may be wrong?

Thanks for the help.

alta-aj · 03-03-2003, 03:25 AM

ttt

TERRYP · 03-03-2003, 04:37 AM

Sender sends 0-90 ohms for a guage. Your sender should be a one wire unit, not 2, that's for idiot lights. Oil pressure, furl and temp use same range, (although 90->0 or 0>90 depending on the use. i keep a gas tank sender around to check guages.

Southpa · 03-03-2003, 05:12 AM

Engine block to frame grounded? Should be one ground strap on each back corner of the motor to the frame. And then frame should be grounded to cab near the middle mounts, I think. The one wire from the gauge to the sender is just a part of the connection. The ground straps should complete the circuit.

03-02-2003, 09:46 PM	#1
alta-aj Registered User Join Date: Aug 2001 Location: Qualicum Beach, B.C>, Canada Posts: 117	Temp. Gauge Input? I have a 79 400 in my 72 Jimmy. Ever since I installed it, the temp gauge hasn't worked. In fact, I'm not even sure if it worked before the engine changeout occurred. I took the sender out today and put a flame to it and the resistance decreased from about 3.4K ohms at about 65 deg. as the temp increased. So, seeing I had responsiveness from the sender, I hooked the (dark green) wire from under the hood back up, made sure the sender was grounded, applied the heat again and still, no response at the gauge. Can anyone tell me what the input to our vintage temp guage is (in case the 79 sender is incompatible) and what the range of the input is? Any other suggestions as to what may be wrong? Thanks for the help.

03-03-2003, 04:37 AM	#3
TERRYP GYRO GEARLOOSE Join Date: Jun 2000 Location: Nevada City, CAEverett, WA Posts: 361	Sender sends 0-90 ohms for a guage. Your sender should be a one wire unit, not 2, that's for idiot lights. Oil pressure, furl and temp use same range, (although 90->0 or 0>90 depending on the use. i keep a gas tank sender around to check guages. __________________ Nevada City, CA Everett, Washington 57 3/4 rat, 235, 3spd 66 C-10 Panel, SWB. 350 from '68, 200R4 tranny, 3.07 rear ratio, restoring 68 C10 LWB 350 4spd, 4.56 rear dump runner 82 Camaro, 305, THM-200-R4 84 Monte Carlo 305 TH350, land tuna 85 Tercel SW, snow runner DISGRACED OUTLAW MEMBER OF THE DRUM BRAKE CLUB

03-03-2003, 05:12 AM	#4
Southpa Registered User Join Date: May 2000 Location: Victoria, BC, Canada Posts: 2,410	Engine block to frame grounded? Should be one ground strap on each back corner of the motor to the frame. And then frame should be grounded to cab near the middle mounts, I think. The one wire from the gauge to the sender is just a part of the connection. The ground straps should complete the circuit. __________________ 1970 GMC 1500 Custom Original 350/TH350 Victoria, BC, Canada You can wish in one hand and crap in the other. See which one gets filled first.

03-03-2003, 03:25 AM	#2
alta-aj Registered User Join Date: Aug 2001 Location: Qualicum Beach, B.C>, Canada Posts: 117	ttt



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