R32 Electrics Gone

[sama1500]

so recently my r32 was dying due to the alternator not charging the battery, i took it out and replaced it with an rb25 alternator as i found they bolt right in and can be used on the rb20, went to reconnect my battery and got a couple sparks while doing so even though i made sure no electrics were on, however connected it up and car started up first go no worries. The problem is my electrics now dont work, no interior lights, no radio, no dash lights, no windows/mirrors. the parkers and headlights/tail lights still work and all mechanical components work normally, any ideas what this could be?

[admS15]

Check fuses everywhere and hope you find some blown ones. Unfortunately that's all I can offer. Gl.

Edited August 22, 2015 by admS15

[Ben C34]

Fusible link blown

[sama1500]

Sorry for the dumb question but what's a fusible link? Don't know much when it comes to electrics

[iruvyouskyrine]

Fusible like = fuse.

[sama1500]

oh right, i'm fairly sure the rb25 alternators run more current than the rb20 ones but does anyone know how much each run?

[GhostK]

Not sure if r32 would have big wiring loom running inside the drivers side front guard but i had similar dramas with r33 electrics, coz of car being too low, tyres rubbed through the big wiring loom and all the wires were melted together.

[sama1500]

i think they do however i'm fairly sure mine has been tucked and my car isnt crazy low either, i've never had any issues with my electrics but as soon as i turned the car on with the new alternator everything stopped working

[sama1500]

so i'm pretty sure i found the problem, main fuse completely gone lol, the one that says 75A in the engine bay, does anyone know how much current an rb25 alternator flows? im assuming the rb20 ones flow 70A and rb25 flows more than 75A

[Sinista32]

The issue is when you first connected it up with the battery. That's when it blew. The car wasn't even running.

I don't believe the replacement alternators ampage is the issue as there is not a significant difference.

[sama1500]

alright well i'll try a replacement 75A fuse for now, did a bit more searching and found out the rb25 alternators are rated at 90 amps, will this affect anything?

[Hadouken]

Well it can draw up to 90A.

If you have a fuse rated to 75A, it will probably blow when the alternator decides it needs more juice.

But I think all will be sweet.

[t_revz]

Put another 75 in. Unlikely alternator will pop it.

[sama1500]

I'll try putting in another 75A one tomorrow in that case and see what happens

[blind_elk]

Well it can draw up to 90A.

No, it PRODUCES (up to) 90A, then feeds it back into the battery. That amperage does not go through the fusible links, there is no risk that the alternator can blow the links or other fuses.

FWIW, in the "olden days", my 180B SSS ran a quite small alternator - about 45A. Because it used 100W Cibie driving lamps in "rally car" trim, the alternator was upgraded to about 80A, with no other modification to the electrics, and no problems with fuses blowing. Such an upgrade was quite commoin in rally cars of the day (70s, 80s).

[sama1500]

all fixed and electrics seems stronger than ever thanks to the extra amperage of the rb25 alternator

Edited August 28, 2015 by sama1500

[Missileman]

so... what was it?

...how did the alt installation go? any problems or changes to get it to fit?

[sama1500]

main fuse was blown and i wired up a power cable which i thought was an earth cable incorrectly, so got it wired up properly and it all works sweet now

[sama1500]

the only problem was the power cable that looked like an earth, on the rb20 its too small to fit on the rb25 nut so you have to cut it and put a bigger one on, other than that its perfect fitment so i'd recommend it to anyone who's electrics seem weak