I have a 1988 Honda CRV. I just put in a new alternator but forgot to take the battery cables off and blew the inline fuse. When I replaced the fuse it blows again when the battery hooks up to the alternator. The alternator is fine, what is wrong?

first thing take the 120 amp fuse out and throw it away
the 100 amp fuse was installed originally to protect the wiring and other related parts
next by connecting to the wrong terminals there is a power surge that can damage the electronics in the ECM unit and alternator
removing a battery for a charge can corrupt the immobiliser system
I would suggest that you use a scanner to read any fault codes that may be stopping the engine and then reset the CPU program in the ECM to reset the immobiliser

52 plate?
blew keyon, or key off, drumming fingers now..... straight = key off?
you do have a big short. and saved the fire.
so what is it, the FSM shows you all loads on that fuse.
so does the schematics at alldata.com. look. we do every day.
no years stated, so i can not look,

the 100a might be a shorted, alternator, but id bet its the harness. (crash)

what we do in a real shop is use 2 cheap tools to find all shorts.
Hard one>/
we use a DC battery charger, True DC not pulsing DC, quality !!
then with my DC amp camp meter,
I do this.
i disconnect the battery and put in a fuse bypass, 100amp. (jumper wire with 30amp fuse inline, like all FSM say to do)
i next attach my charger, minus to minus and plus to plus (tender care on polarity)
then i turn the amps know my fancy charger to say 10 amps.
an nice safe quantity.
i have current flowing now and then, use my amp clamp
on all wires on the main fuse box to find what line is shorted.
it shows 10amps to alt.
i unplug the ALT and bam, no more short.

that is how i do it.
ive found vast numbers of shorts in many systems.
car, , ships, trains , and other complex systems.
deep in to place , nobody ever goes.. some wild stories.
sea story:
on one ship , i found a short in a huge compartment on a CVA . (63? i forget now , 1973?)
that was not even documented,, later the crew fought over this space.
funny stuff, (no one could find it, but I had a TDR tester and that is
really a wire RADAR, finds the exact distance to the short)
to a 10th of a meter. tool.
this system was emergency radio.

any good DC power variable supply works here, use any with an
AMPS knob......
i post this to stop guessing and to save the cost for 100amp fuses
can cost more than the tools.

Check to see if alternator is charging. Battery light is an indicator that your alternator is not charging. Start engine use multimeter at battery 20 v dc or if autorange meter just dc. engine at idle the battery should read 14 - 14.5 volts. if not replace alternator.

I put a new battery in Honda CR-V car still dead no lights nothing tried jumping it still nothing could it be alternator on battery cables?

Are you talking about fuse # 15 in the Power Distribution Center under the hood? The 70 Amp fuse?

There are only a few things that can make this fuse blow:

1. The battery is installed backwards
2. There is a short to ground in the alternator or the battery cable that goes to the alternator
3. A defective/shorted Electrical Load Detector Unit (ELD)

I guess you have allready found out, so I don't need to preach to you about how replacing a fuse without FINDING and CORRECTING the REASON it blew, will only cause another innocent little fuse to have to give up its life to keep your vehicle from burning to the ground!

Most parts stores carry these. if not may have to call your dealer. Good luck.
But you really need to check out closely and find what blew the fuse.

SOUND LIKE ALTERNATOR PROBLEMS.CHECK ALTERNATOR FUSE LINK + FUSE.ALSO THE WIRES TO ALTERNATOR.MAKE SURE YOUR BATTERY CABLES IS CLEAN AND FREE FROM CORROSION.

Hi,welcome to fix ya.
It sounds like you are not getting power to the alternator if it is really god. check the large wire at the post with your meter it should have the same voilage as the battery. if not try cleaning the connections at the battery and check the inline fuse link .

Could be an open connection in the line feeding the battery. Is there a fusible link inline? If so check the fuse or the line itself. Run on Ohm test from alternator to battery; this will tell you if the circuit is good. Sometimes it's as simple as a corroded or loose connection.

in a 4 cylinder diesel 2x cp 70 in front cp71 in the rear the reason why inline fuse blew cause by an electrical fault in the alternator thanks heaps after the alternator was replaced it work