Inline fuse short

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Model T Ford Forum: Forum 2016: Inline fuse short
Top of pagePrevious messageNext messageBottom of page Link to this message  By Derrick Pang on Monday, June 27, 2016 - 08:28 pm:

Hey all, we put in a new inline fuse attached to the starter. Everything is wired correctly as far as generator cut out, ignition switch is not touching, no wire seems to be touching any bare metal. Yet each time we put In the fuse it burns out. Any idea where this short comes from?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Derrick Pang on Monday, June 27, 2016 - 08:31 pm:

The yellow power wire seems to be getting hot, so we don't know where it's hitting.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Rod Barrett - Anderson, IN on Monday, June 27, 2016 - 08:37 pm:

The easiest way to trouble shoot a short is to replace the fuse with a 6 volt, 100 watt light bulb. When the light bulb gets bright you have a short. Remove one circuit at a time until the light goes dim. The short is repaired when the light no longer is fully lit. Now replace the bulb with a 20 amp fuse.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Derrick Pang on Monday, June 27, 2016 - 08:44 pm:

Ok we will try that! Thanks


Top of pagePrevious messageNext messageBottom of page Link to this message  By Chad Marchees _____Tax Capital, NY on Monday, June 27, 2016 - 08:48 pm:

Using the light bulb is a great idea. Sounds as if you have power going right to ground somewhere. Alternatively, you can DISCONNECT the battery, and use a volt ohm meter (dvom) and use the ohm setting starting at the power wire on the starter switch and touching the other lead to ground. It should show continuity (zero, or near zero resistance). Disconnect one circuit at a time (at the terminal block) to see what will make the meter jump to infinite ohms.

Once you found the exact circuit, inspect carefully, could be as simple as a pinched wire between metal or not and bolt.


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