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Fuse locations

Mark Elder

Mark Elder

PCGB Member
Member
Is there more than one fuse box? The only one I know about is under front bonnet (in front of steering wheel) with about 40 fuses in it and 8 or 10 relays. But I know many cars have more than one.

I've had a sudden battery drain problem develop this week but I don't think it's the battery - I think I have something staying on and draining the battery.

Today I disconnected the battery and put an amp meter in series with it and started pulling fuses to work out what uses power. But the odd thing is that none of the fuses in that fuse box changed the reading on the amp meter. I went through the whole box one fuse at a time. So is there another fuse box? Surely everything is fused?

My car was pulling 60 milliamps most of the time but every 11 seconds or so was spiking to 250 milliamps for about half a second. Anyone seen this spiking?
 
There is at least one more - in the engine bay - sorry can't remember for sure but I think it's on the right. There are fuses there for the blower fan and A/C clutch. Could be a fan coming on intermittently but I'd have thought you'd have heard that. Regards Anton
 
There’s one in the engine compartment on the left as you look in, I believe. Never looked inside this one. Only once looked in the front compartment one, just to replace DME relay [;)]. Are your bonnet/engine lid/door post courtesy lights all free and working as normal? These can sometimes cause hidden problems.
 
Thanks guys - I'll have a go with the rear fuse box tomorrow. Whatever it is, I don't think it's a faulty connection because the 11 second cycle was pretty consistent.
 
Mark, could be some motor coming on for a second or so, can't achieve its function (because it's stuck), going off, and cycling like that even with the ignition off because it's not completed its switched function. Like a footwell servo motor / spoiler or mirror motor, etc. There's also a relay under the back parcel shelf (if you have a rear wiper) and sometimes under the seat (if you have electric seats).
 
Graeme, Yes that's the sort of thing I've thinking - a stuck motor most likely on the cabin heating system. I've now removed the 3 fuses (only found 3) in the rear/left fusebox. Am I right in thinking the relays are all in series with fuses? - i.e. no point in removing relays because they are all fused. In which case there is still something pulling current that is unfused (or I can't find its fuse). Yesterday the background current from battery was 100 milliamps (peaking to 300 every 10 or 11 seconds for about half a second). On Thursday it was about 40ma lower. That is with ignition off and all "interior" lights disconnected. Anyone know where the PA1000 alarm system was fused? Does it have it's own fuse located at the alarm ECU?
 
Pa 1000 fuses underneath the steering column and probably floating on a cable tied wire loom, Check siren draw as they have a regchargable ni-cd that fails eventually, and the circuit can become corroded from engine bay power washes. A quarter of an amp does not sound like a motor or bulb powering up as it seems a bit low. I would have thought all regular systems would have been stopped by one fuse or another, so you could be on the right track.Relays should be pulled just in case as one sife of the relay usually has permanent power,although in theory it would need to be energized to transfer it to a consumer. No aftermarket audio/telephone or tracker/alarm stuff installed other than what you have stated? Christian...............
 
Don't believe every single motor is fused, though, either, Mark, so reckon they still need to be on the list of potential suspects. Particulalry in the case of the footwell and dashboard servo motors or wing mirror motors which are very small just to move a plastic flap so don't draw much current. Looks like it'll be a long process of elimination. So after the fuses you've pulled so far, still with them out I'd pull the positive spade connectors off each of the various (smaller) motors in turn, or off the switch for the relevant component if access difficult to the motor, and see if you're getting the same peaks. Because it fits the perfect pattern of a motor attempting to complete its function but failing. Whichever approach you adopt it's trial and error until finding the culprit, IMHO
 
Has any one the picture as to how the fuses should be looking on a 2005 987 Boxter. My electrician has taken one 15 amp

blue and it need replacing.. But where. Thanks

 
there is no data on the back of the fuse lid

one fuse missing on line 1

one fuse missing on line2

possibly 2 on line 3

which dimensions amps difficult to tell!

 
The following may help

[link=https://rennlist.com/forums/987-981-forum/1163864-fuse-box-help-987-boxster.html]https://rennlist.com/forums/987-981-forum/1163864-fuse-box-help-987-boxster.html[/link]

 
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