Fuse Keeps Blowing- advice? |
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Fuse Keeps Blowing- advice? |
mikedsilva |
Mar 15 2015, 05:38 AM
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#1
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Member Group: Members Posts: 90 Joined: 23-February 15 From: Australia Member No.: 18,462 Region Association: Australia and New Zealand |
My new to me, 1970 914/4, has some iffy electrics..
The fuse in the number 7 spot, keeps blowing as soon as I turn the key to ignition on. So, this means I dont have any indicators or wipers working.. etc. Electrics are a little mysterious to me to be honest.. I do have a multimeter.. but I am not sure how to track this problem. I'm thinking I have a short somewhere on one of those systems.. Should I start by trying to unplug each and every component that uses that circuit, then reinstall another fuse, and turn the ignition on? How would an experienced auto electrician pinpoint a problem like this? Any and all advice appreciated.. Cheers Mike. |
stugray |
Mar 15 2015, 09:58 AM
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#2
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
You can do a test like thieuster says using your DMM.
Take out the fuse that keeps blowing.With the meter set on Volts, connect the black to the car chassis, turn on the ignition, then check to see which of the two terminals have 12 volts. This is your "source" side it supplies the power. The opposite side of where you found voltage is the "load" side. Turn off the ignition. Now set the meter to Ohms and IF you have the option set it to continuity or "audible". It should beep when you connect the leads together. Now connect the black to the car chassis again and the Red lead to the "Load" side of the fuse holder. Read the Ohms reading on the meter and IF the short is present the meter should be sounding the audible alarm. If you dont have the audible option, then you need to place the meter where you can see it or have someone watch it. Now go around and wiggle the harness and connect/disconnect all of the items on that circuit. If the audible tone goes away you have cleared the short. |
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