Battery On The Wrong Way

[Peter89]

to get the r31 started, i took the battery out of my s14. without thinking, i just connected up the leads.

thus putting them on the wrong way. switched them around, all good. the car started.

however, non of the electrical features now work. lights, interior stuff, dash. ect.

i have already checked the in cabin fuses but they are fine.

i know very little about r31s, i can't seem to fine any other fuse boxes.

what do you guys think i broke?

[KiwiRS4T]

Maybe the alternator? Don't know about the R31 but most Nissans have a big fusebox with fuses and circuit breakers under the bonnet near the battery.

[Peter89]

but the car runs fine.

there's a small box of relays under the bonnet but i would expect fuses to be protecting them.

[Carbon 34]

to get the r31 started, i took the battery out of my s14. without thinking, i just connected up the leads.

thus putting them on the wrong way. switched them around, all good. the car started.

however, non of the electrical features now work. lights, interior stuff, dash. ect.

i have already checked the in cabin fuses but they are fine.

i know very little about r31s, i can't seem to fine any other fuse boxes.

what do you guys think i broke?

Oh no

Mate you could have killed off half the car !!

the car is neg ground not positive so anything with a relay or fuse , fuse link or diode ( alternator) could be smoked

your going to have to go thru one thing at a time and check the lights too

Your damn lucky if the ecu doesn't have a fried trace or two it would be a miracle of Christmas

Best of luck

[Peter89]

damn.

[reeceo21]

I remember when i was about 12 my dad thought he would play mechanic and put a new battery in his old el wagon, nek minnit put it on the wrong way and fried the ecu, 700 dollars later mother wasn't impressed

[DVS JEZ]

Start by checking all fuses

[GTR-N1]

I remember when i was about 12 my dad thought he would play mechanic and put a new battery in his old el wagon, nek minnit put it on the wrong way and fried the ecu, 700 dollars later mother wasn't impressed

A 12 year old should never take the opportunity (behind Dad's back - but still within earshot), to ask Mum if he can go over to his mate's place when there are chores to be done; that Dad told him to do.

Dads can only 'single-task'!!!

[kitto]

R31's have a fusible link and relay box behind the RH headlight. You may have fried a fusible link, maybe. But i doubt it.

The other fuse box is inside, RH side of the steering column. This is more than just a fuse box though. This is called the HEC or Hybrid Electronic Control unit. Its also considered to be the SMJ or Super Multiple Junction. Only R31's had them and they are not the most awesome of things. But they dont usually fail either.

This unit has a few purposes; its a place for all the fuses and power relays (can't see the relays without removing the unit), it is the major intersection for everything electrical in the car, and it also houses the electronic control module that controls; dash lights, tail lights, wiper control, interior light, trip computer etc. I dare say you have fried this unit.

If you've still got brake lights and head lights but not much else then its a good indication that its cooked.

You can replace just the electronic module or the entire HEC. Should only take half an hour to replace the entire HEC. Grab one from pick a part.

[StevenCJR31]

fuseable link runs off the battery lead. . . check there

[Peter89]

R31's have a fusible link and relay box behind the RH headlight. You may have fried a fusible link, maybe. But i doubt it.

The other fuse box is inside, RH side of the steering column. This is more than just a fuse box though. This is called the HEC or Hybrid Electronic Control unit. Its also considered to be the SMJ or Super Multiple Junction. Only R31's had them and they are not the most awesome of things. But they dont usually fail either.

This unit has a few purposes; its a place for all the fuses and power relays (can't see the relays without removing the unit), it is the major intersection for everything electrical in the car, and it also houses the electronic control module that controls; dash lights, tail lights, wiper control, interior light, trip computer etc. I dare say you have fried this unit.

If you've still got brake lights and head lights but not much else then its a good indication that its cooked.

You can replace just the electronic module or the entire HEC. Should only take half an hour to replace the entire HEC. Grab one from pick a part.

ill check it out however, nothing works including brake/head lights.

[DVS JEZ]

Have u tested fuses yet?

[Tommy Kaira RL]

Lights should still work if they are direct fed from a battery source. They are not polarity dependant. So if there not working they must be fed from a Control Module that could be fried.

You might have to get a multi meter out and start checking where the 12v goes into and where there should be an output.

You might need a wiring diagram.

[Scott Black]

im surpised the car still runs as it normaly just blows the alternator fusable link, however it can also blow other fuses, and thats what it should like has happenend.

[daneR31]

How did u fix this problem it happened to me only I didn't touch the battery please help