You need to isolate the circuits, pull fuse's till the fuse doesn't blow ! Any one of those circuits could have your short. A/C compressor relay, rear window defroster relay ,daytime running lights. you will also see it powers the igintion switch ,look at last part of ignition switch, when in start or run that 40 amp fuse powers all those other fuse's plus three relays i see there also. You will see Ign A 40 amp fuse at the top of the page. First blue link scroll down to the second diagram. year, make, model an engine, Under system click on electrical distribution, under sub system click on power distribution. That 40amp fuse powers a lot of subsystems ! If you were to jump 30 to 87 in the relay box the starter should spin the engine over, not start an run just spin ! 85 & 86 is the control side. If you pull the relay out of the box it's plugged into an look on the bottom of it you would see four sets of numbers ! 30 & 87 an 85 & 86. Which fuse ? IGN A - 40 amp ,under hood fuse / relay box ? This fuse powers the Starter Relay and Ignition and Start Switchĭoes your vehicle have a manual or automatic transmission ? The starter relay could be shorted inside, It's also located in the under hood fuse box. What all does that fused supply B+ voltage too ? Do you know ? That would be your first thing to find out ! Do you know what a electrical distribution diagram is ? Do you know how to test electrical circuits with a DVOM - digital volt ohm meter ? Do you know what a short to ground is ? This load test will give you the exact amp draw of the starter and solenoid and then they can tell you if it exceeds the manufactures spec. Remove the starter and take it in to a reputable Auto parts store and ask them to perform a load test. Once the bolts are removed the starter will already be wanting to come out. Once the wires are removed you will have two 9/16(generally) bolts that can be removed with a socket and ratchet. The Starter will need to be removed, taking the positive cable loose from the battery, then remove the battery cable from the starter with a 1/2 or 9/16 generally socket and a 5/16 generally for the solenoid wire. If this was the test performed this is not an accurate test for a starter. I am not sure how they tested your starter, however I have seen several auto parts stores use a diagnostic load machine that checks the starting system without the removal of the starter. Again use a wire brush to clean both surfaces and check the cable ends (eyelets) for a good connection. Then move to the starter, Using a 5/16 remove the solenoid wires and a 1/2 or 9/16 to remove the battery cable from the starter. Using a socket to remove the ground cable, once removed use a stiff wire brush to clean the surface of the block, then reconnect to the block. Also check and clean the connecting points. (The starter and the block) Make sure they do not have any broken insulation or dark discolorations in the insulation which represents excessive heat and a weak spot in the cable. But before reconnecting them, inspect the cables from the battery to their respective connection points. Using a terminal brush clean both the negative and positive terminals. If it's a top post then it's likely to be 7/16 or 10mm. I would suggest removing the battery cables, If it's side post a 5/16 wrench or socket. One is that you have a bad connection either on the battery or on the starter or even a bad battery cable. There may be several issues causing you problem. To learn more about how and for what purposes Amazon uses personal information (such as Amazon Store order history), please visit our Privacy Notice.SOURCE: What could cause a 40 amp ignition fuse to keep You can change your choices at any time by visiting Cookie Preferences, as described in the Cookie Notice. Click ‘Customise Cookies’ to decline these cookies, make more detailed choices, or learn more. Third parties use cookies for their purposes of displaying and measuring personalised ads, generating audience insights, and developing and improving products. This includes using first- and third-party cookies, which store or access standard device information such as a unique identifier. If you agree, we’ll also use cookies to complement your shopping experience across the Amazon stores as described in our Cookie Notice. We also use these cookies to understand how customers use our services (for example, by measuring site visits) so we can make improvements. We use cookies and similar tools that are necessary to enable you to make purchases, to enhance your shopping experiences and to provide our services, as detailed in our Cookie Notice.
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