{"id":59726,"date":"2020-03-14T06:43:15","date_gmt":"2020-03-14T13:43:15","guid":{"rendered":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/?p=59726"},"modified":"2020-03-14T06:43:17","modified_gmt":"2020-03-14T13:43:17","slug":"installed-battery-backwards-e28-518i-5-series-bmw-1986","status":"publish","type":"post","link":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2020\/03\/installed-battery-backwards-e28-518i-5-series-bmw-1986","title":{"rendered":"Installed battery backwards E28 518i 5 series BMW (1986)"},"content":{"rendered":"

\"1986-bmw-518\"<\/p>\n

Hello, instead of connecting the positive terminal of the battery<\/a> to the starter motor, I connected it to ground. At first I did not see any spark because the ground terminal was disconnected. But when i approached the ground wire to the battery negative terminal a spark appeared. After fixing my mistake, the fuel pump does not stop when the key is turned to “start” position and there is no crank<\/a>.<\/p>\n

What is the most common fault that it is expected to have from my mistake? Fried ECU? Fried starter? Bad ground connection? Thank you<\/p>\n

\n
\n

Double check your connections and then make sure the battery is fully charged. Check the related fuses and relays. Sounds like the fuel pump relay is stuck on. I don’t think you harmed the starter. If you hurt anything it would be the battery.<\/p>\n","protected":false},"excerpt":{"rendered":"

Hello, instead of connecting the positive terminal of the battery to the starter motor, I connected it to ground. At first I did not see any spark because the ground terminal was disconnected. But when i approached the ground wire to the battery negative terminal a spark appeared. After fixing my mistake, the fuel pump… Read More »Installed battery backwards E28 518i 5 series BMW (1986)<\/span><\/a><\/p>\n","protected":false},"author":15627,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1,156],"tags":[],"class_list":["post-59726","post","type-post","status-publish","format-standard","hentry","category-auto-repair-questions","category-bmw"],"yoast_head":"\nInstalled battery backwards E28 518i 5 series BMW (1986) - FreeAutoMechanic Advice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2020\/03\/installed-battery-backwards-e28-518i-5-series-bmw-1986\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Installed battery backwards E28 518i 5 series BMW (1986)\" \/>\n<meta property=\"og:description\" content=\"Hello, instead of connecting the positive terminal of the battery to the starter motor, I connected it to ground. At first I did not see any spark because the ground terminal was disconnected. But when i approached the ground wire to the battery negative terminal a spark appeared. After fixing my mistake, the fuel pump… Read More »Installed battery backwards E28 518i 5 series BMW (1986)\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2020\/03\/installed-battery-backwards-e28-518i-5-series-bmw-1986\" \/>\n<meta property=\"og:site_name\" content=\"FreeAutoMechanic Advice\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/freeautomechanic\" \/>\n<meta property=\"article:published_time\" content=\"2020-03-14T13:43:15+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-03-14T13:43:17+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2020\/03\/1986-bmw-518.jpg\" \/>\n<meta name=\"author\" content=\"Alvaro Martinez\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Alvaro Martinez\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Installed battery backwards E28 518i 5 series BMW (1986) - FreeAutoMechanic Advice","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2020\/03\/installed-battery-backwards-e28-518i-5-series-bmw-1986","og_locale":"en_US","og_type":"article","og_title":"Installed battery backwards E28 518i 5 series BMW (1986)","og_description":"Hello, instead of connecting the positive terminal of the battery to the starter motor, I connected it to ground. At first I did not see any spark because the ground terminal was disconnected. But when i approached the ground wire to the battery negative terminal a spark appeared. After fixing my mistake, the fuel pump… Read More »Installed battery backwards E28 518i 5 series BMW (1986)","og_url":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2020\/03\/installed-battery-backwards-e28-518i-5-series-bmw-1986","og_site_name":"FreeAutoMechanic Advice","article_publisher":"https:\/\/www.facebook.com\/freeautomechanic","article_published_time":"2020-03-14T13:43:15+00:00","article_modified_time":"2020-03-14T13:43:17+00:00","og_image":[{"url":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2020\/03\/1986-bmw-518.jpg","type":"","width":"","height":""}],"author":"Alvaro Martinez","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Alvaro Martinez","Est. reading time":"1 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