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Old 02-05-2014, 09:51 AM
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Join Date: Jan 2009
Location: Western MA
Posts: 105
Best place to tap into electrical system?

I will be adding a couple of circuits to my 85 300sd. One for powered sub, one for a seat heater. Where is the best place to tie into both 12v and chasid grounds? I don't see any spare fuse locations in the fuse box.

It would be nice to keep all fuses in one location (fuse box) but maybe it would be easier to tie into the terminal block near the alternator and use in-line fuses? Directly at positive lead of battery?

Also, Where is the best place to go through the firewall/dash?

Thanks in advance.
1985 300SD 99K
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Old 02-05-2014, 10:01 AM
Registered User
Join Date: Jan 2009
Location: Western MA
Posts: 105
I will also, of course, need to tap into switched power.
1985 300SD 99K
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Old 02-05-2014, 06:06 PM
Kyle Blackmore's Avatar
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Join Date: Sep 2001
Location: almost beyond Hope...B.C.
Posts: 905
On my 380SE I went through the firewall behind the battery. There was a spare 'tit' on the rubber grommet that I opened and pushed my power lead for the amp through, for the switched power I tapped into the blue power antenna lead from the aftermarket head unit.
1985 380SE- 160,000km 'Blistu' - Sold
1988 300CE- Eva,my garage mistress
2007 R350 4matic- The Black Pearl
2011 Ford Ranger-Work truck
1974 25' Trojan Sea Raider- 'Grannyknot'
2002 215 cm Atomic DH skis- Canadian SDH record holder, 175.5km/h- Vars 2010
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