Fuse diagram needed for early E3/E9. Wiring FAQ?

dang

dang

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ALL of the gauges on the '69 E3 started bouncing around the other day like they do when you have a bad ground, except that all of them were doing it in unison. When I started investigating I noticed a blown fuse, then I realized I don't know which fuse is for what circuit. Anyone have a diagram for an early system?

Also, is it just me or is it hard to find electrical diagrams and schematics on this site? FAQ needed? Tech section additions?

Dan
 
There is a diagram in the owner's manual at the back. Also, it seems really odd that all the gauges would respond in unison to an electrical problem. I had thought the speedometers on the earlier e3s and e9s were gear driven.
 
Ohmess said:
There is a diagram in the owner's manual at the back. Also, it seems really odd that all the gauges would respond in unison to an electrical problem. I had thought the speedometers on the earlier e3s and e9s were gear driven.
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All the electrical gauges were bouncing, the speedometer still works. My fault for not being more specific. I'll have to search for my Owner's Manual. It may be a bad ground and caused and old fuse to pop while surging, but I've never seen all of the gauges do it like that.
 
Which fuse is it?
IMG_1109.jpg


IMG_1107.jpg
 
Try this one. I did have one fuse that was causing the right side running lights to not work intermittently. I had to clean the ends of the fuse and it has worked since. You might try that with #7.
Fuse Decal.png
 
I scanned several e9 wiring diagrams for the FAQ, all someone needs to do is go to FedEx/Kinkos and have them scanned and put on a USB drive. I had them printed at 24x36” as well.

Coupe Wiring and Relays

This Thread will attempt to display the wiring legends, diagrams and relays for both euro and US versions with photos and descriptions. 2800CS Early (Feb and Jun 1970) 1) Wiper Delay: brown/black (2), green/black (2), black 2) Wiper Changeover: green/black (2), brown/red, black (2)...
e9coupe.com e9coupe.com

If someone would take relay photos I can add those as well for the e3.
 
SOLVED! To begin with, taking the gauge cluster out of an E3 is probably the easiest I've ever done in any car. I checked the cluster and it looked good, checked wires at the fuse and looked good, then I noticed the fuse was used for the fuel-oil pressure circuit also. Turns out the wire that went to the oil pressure switch had broken off and was shorting on the block. Easy fix.
 
bluecoupe30! said:
Nice save. Love it when the source of the problem is obvious and you can sort it straight away. :) Thanks for posting solution.
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I've been chasing an electrical gremlin in that Mercedes I bought and it's very frustrating since I haven't made any progress in over a month. Finding the problem on the E3 was refreshing to say the least.
 
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