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R32 Electrics Gone

sama1500

By sama1500,
in General Maintenance

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sama1500 Collaborator

sama1500

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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?

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GhostK Contributor

GhostK

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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.

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post-140925-0-05080000-1440309697_thumb.jpg

sama1500 Collaborator

sama1500

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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 Collaborator

sama1500

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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 Grand Master

Sinista32

Posted
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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.

blind_elk Grand Master

blind_elk

Posted
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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).

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sama1500 Collaborator

sama1500

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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

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