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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

wiring nightmare

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Old Apr 4, 2007 | 10:29 AM
  #16  
merlynr's Avatar
merlynr
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Originally Posted by reecem13
if the volt meter detects voltage, a test light would light too wouldn't it? Is it possible for the grounds to make these problems?
A voltmeter detects voltage, but may not be enough current to light a bulb. the trble could be a high resistance ground. Using Ohmmeter, check circuit resistance of wires. Should be near zero. Have to check resistance with no voltage on the circuit, so battery should be removed from the circuit. The voltmeter internal battery provides the power when checking ohms. Always zero the meter on the scale you are using by shorting the probes on meter and using ohms adjust ****. Battery in the meter needs to be good for resistance measurements. Like Dennis said, may be a bad ground which has high resistance.
 
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Old Apr 4, 2007 | 03:44 PM
  #17  
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mhg
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From: savannah,ga
Yes the grounds will make it act just as you descirbed
a bad ground at any point will send voltage back thru the other element of the bulb
and thru any other avail ground
its hard to explain how but trust us it does it
if you look at the 1157 bulb you can follow the voltage into
one element then back out the other element to any ground
 
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Old Apr 5, 2007 | 05:35 PM
  #18  
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reecem13
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alright, i finally got fed up with it and took it to someone. got it back within a day. he said it was the ground wire that runs along the frame with the other four. he cut the connector out because that was where the bad place was. they work fine now. Now if it would only start reliably. it took me 30 minutes just to get it started at the guy's house that fixed the lights.
 
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