# 1984 Ford F100 - Alternator wiring

**URL:** <https://community.cartalk.com/t/1984-ford-f100-alternator-wiring/176698>\
**Category:** Maintenance/Repairs\
**Tags:** electrical-wiring, ford\
**Created:** [May 10, 2021, 1:56am UTC](https://community.cartalk.com/t/1984-ford-f100-alternator-wiring/176698 "2021-05-10T01:56:17Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![TrevorBaker](https://avatars.discourse-cdn.com/v4/letter/t/c5a1d2/32.png) [@TrevorBaker](https://community.cartalk.com/u/TrevorBaker)\
**Post date:** [May 10, 2021, 1:56am UTC](https://community.cartalk.com/t/1984-ford-f100-alternator-wiring/176698/1 "2021-05-10T01:56:17Z")

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connected B+ wire from alternator to positive on battery the D+ wire goes to warning light on dash but as soon as I connect the negative to battery it burns out the wire from positive terminal to the alternator. Can you tell me what is causing the wire to burn out Thanks.

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**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\
**Post date:** [May 10, 2021, 2:12am UTC](https://community.cartalk.com/t/1984-ford-f100-alternator-wiring/176698/2 "2021-05-10T02:12:11Z")

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somewhere you have a positive and negative connecting. retrace all your wires. you are also bypassing the fuse box, because a fuse should blow before a wire burns up.

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**Author:** ![oldnotdeadyet](https://avatars.discourse-cdn.com/v4/letter/o/a6a055/32.png) [@oldnotdeadyet](https://community.cartalk.com/u/oldnotdeadyet)\
**Post date:** [May 10, 2021, 4:47pm UTC](https://community.cartalk.com/t/1984-ford-f100-alternator-wiring/176698/3 "2021-05-10T16:47:12Z")

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Measure the resistance from the B+ battery to ground. Your alternator may have a short. What size wire are you using?  
Start at the beginning and tell us why you are doing this.

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**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\
**Post date:** [May 12, 2021, 3:47am UTC](https://community.cartalk.com/t/1984-ford-f100-alternator-wiring/176698/4 "2021-05-12T03:47:37Z")

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What led up to this problem? The wire from the alternator to battery should have a fusible link and nothing should burn up. Is this what you have?

 ![image](https://global.discourse-cdn.com/cartalk/original/3X/3/b/3b811a8362ec58366e75a8fe673a3fe05d9e9082.png)