Question about 2000 Toyota 4Runner

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We need to replace the 120 amp alternator fuse but the prior fuse may have melted and is blocking new installation. How can we be sure we don't do more harm without taking it to a shop just to replace a fuse?

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  • jillteer Mar 12, 2009

    The fuse was blown when a neighbor accidentally crossposted the terminals on the battery. He was trying to help by giving us a jump. :/


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A short or a bad battery could have caused the problem.  If your taking it to a shop for repair, it becomes their problem and not your problem.

Posted on Mar 12, 2009

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Will a blown fuse keep a dodge the coda 2000 with a 4.7 from starting the fuses 140 amp fuse that runs from the battery to the alternator

Hi Kelly, IM AL the owner of Big As Auto Repair.

YES Kelly that fuse will keep the vehicle from starting, If you install a new fuse and it blows again you most likely have a shorted alternator, to check it out, simple unhook the power wire from the back of the alternator, install a new fuse and if it does not blow again then replaced the alternator with a new one. CAUSION: Please be very careful not to let the power wire from the alternator touch anything be cause it can melt something. Best way is to unhook the battery, take the wire off and wrap it with a towel then hook the battery back up and do your test with the fuse. Hope this helps and please visit my auto-repair-website:

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From the diagram I am looking at, the red wire is the hot feed to the fuse block. it also loops back to the alternator and is plugged into the alternator along with a brown wire. I'm also looking at another leg that goes to the horn relay. What I'd do there is cut the wire right at the fuse block and replace it with another of the same gauge. Run it to the alternator, also removing the original wire. I'd check the alternator and make sure it's not internally shorting, check the wire from the battery to the alternator as well and also check the horn relay. While testing, I'd install an in-line 40 or 50 amp fuse in the line 'till I was sure it's working right. One good don't have an elaborate computer system to contend with! Remember....'vettes are more like boats in that they require grounds in places normal cars don't. (because of fiberglass body) So, always make sure your ground points are good. If you still have a problem, I'll be happy (not really....I hate reading schematics) to look again and give you more if I can.
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If things got hot enough to blow your 100 Amp fuse, it has probably melted plastic and metal together. Those large enclosed things in your fuse block are referred to by Toyota as "fusible links". Those things are hard to get out when they haven't melted. You will probably have to use a pair of pliers to get it out. The 100 Amp fusible link goes to your alternator. I hope you have corrected the problem that caused it to blow. Most of the time, when that fuse gets blown it is because somebody tried to jump-start a car and got the cables hooked up backwards. If this is the case, it could have done some serious damage to computer components and the alternator as well. Once you have replaced it, you need to check EVERYTHING to make sure it is all functioning properly. That bad-boy is nothing to mess with. It takes a HUGE voltage spike to blow that one!

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OK, first, I think it may be the alternator. If you charge the battery overnight, the engine should run for about an hour before it discharges again.
I don't think the coolant should affect the wiring.

There may be a fuse panel for the high current fuses in the engine compartment. It should be 30 amp or higher.

Does the generator/alternator/battery light come on when the key is in ON position?

What engine? 1.9L or 1.8L?
VIN Number?

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My 2002 galant fuse box has melted where the ac fuse goes can it be fixed without replacing the fuse box?

Hello stanford8
A new or used fuse block is the recommended way to go. But in a
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Yes you can safely do the swap.but if the voltage does not match the fuse will blow.In that case replace the fuse with bit high ampere then actual fuse.this will help. Thanks.

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Wire color scheme for alternator plug.

ok ric , now the tensioner , notice a 15mm bolt head on the tensioner pulley , put a wrench on that 15mm head and turn clockwise , that will unload the tensioner , install your belt according to the belt wrap picture under the hood , release tensioner , and you should be good to go . however ,,,,,
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good job


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