Re: Fuel sending unit electrical question
[Re: repad]
#515097
11/03/09 10:00 AM
11/03/09 10:00 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Yes ~5 volts. I'd check the VL under the dash & see whats shorted.
live every 24 hour block of time like it's your last day on earth
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Re: Fuel sending unit electrical question
[Re: repad]
#515099
11/03/09 10:12 AM
11/03/09 10:12 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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With your VOM one voltage limiter terminal (input) should have ~12V (battery voltage). another terminal goes to ground (to a dash screw via the copper printed circuit strip) and the 3rd one needs to be 5V. I forgot which is which but eyeball the routing of the copper strips as the (5V) output goes over to the temp gauge also. If it is bad I would for sure get an electronic replacement type.
live every 24 hour block of time like it's your last day on earth
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Re: Fuel sending unit electrical question
[Re: Andrewh]
#515101
11/03/09 02:51 PM
11/03/09 02:51 PM
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Joined: Jun 2008
Posts: 1,822 Colorado
denfireguy
top fuel
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top fuel
Joined: Jun 2008
Posts: 1,822
Colorado
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Quote:
I never put a meter on mine, did you check with a light? it should blink if it is wokring.
A light will only tell you there is voltage there, not how much. You can get a digital volt/ohm meter from Harbor Freight for less than ten bucks. Since these regulators do go bad and will burn up your gauges, it would be less than the cost of a burned up temp gauge. Burn up your harness, and you are talking more than a precision laboratory grade meter. Right tool for the job. Craig
2014 Ram 1500 Laramie, 73 Cuda Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango Only previous Non-Mopar: Schwinn Tornado
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Re: Fuel sending unit electrical question
[Re: repad]
#515103
11/04/09 04:52 AM
11/04/09 04:52 AM
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Joined: Mar 2006
Posts: 16 London England UK
Matt_Snowball
member
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member
Joined: Mar 2006
Posts: 16
London England UK
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NO, no , no .
THe factory regulator does not reduce 12v to 5v . It just switches the 12v supply on & off regularly, like a turn signal unit, so that over a period of time, the gauges will 'see' an average of around 5v . If you put a meter on the line you should see a sequence of 12v , 0v , 12v , 0v etc etc .
An electronic replacement regulator WILL put out a constant 5v , but this is absolutely not what the factory item does.
The gauges will function roughly the same with either method, as they use hot wires and react slowly to any voltage change.
Last edited by Matt_Snowball; 11/04/09 05:06 AM.
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