have a 2001 dodge 2500 24 v 5.9 cummins. it's been a great truck and have had it for 6 years and have over 300,000 miles. after i hit the 300 mark, i've been dumping money into it left and right but have a new problem. original alternator went out one evening withe the usual power drain. charged up batteries(which are 6 months old and test good) and installed new alt. same problem stared it up voltmeter read 12 and dipped down.... opened fuse box and found that 140amp alt. fuse had blown. ran to store and all they had was 120 and it blew immediately! what could cause it to blow in the first place and did it blowing a second time ruin new alt.? drove to work this morn on fresh charged batt. and am charging them now. this is my only vehicle and i need it up and running please help me figure this out

 

look at the big wire coming off the back of alt. make sure it is not grounded out to any thing. if not un hook wire and see if it blows the fuse.if it does that wire is grounded between the fuse and the alt. if not prob. a bad alt. hope that helps

 

any suggestions on where to find a 140 amp fuse on a rainy sunday morn.? can find 120s but can't find 140. i've tried napa and pep boys

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after replacing cable from battery to fuse and double checking cable off alt, i think i got it...running a 120 amp fuse instead of 140 cause it's all i could find... voltmeter shows 14 and dips a little but goes right back up. hopefully it's just because of the 120 amp fuse thanks

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