Newbi - asking for clarification on electric components in engine bay SE5a

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Newbi - asking for clarification on electric components in engine bay SE5a

Post by scimifunze » Tue Mar 24, 2020 4:14 pm

Dear All,
as I am well into mechanical but not so much in electrical maybe somebody can help me - what are number 1 - 6?
Prior MOT / TÜV I want to be sure / make the car electrical reliable, I assume at least no 3 is some kind of capacitor, look very old, would like too exchange it and eventually other of that relais etc. if make sense for reliability.
.
Since there is some oxidation, will look as well into all cable connector, cleaning and conserve with "Talamex wp 100".

Thanks in advance.
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Newbi - asking for clarification on electric components in engine bay SE5a

Post by gtcse8 » Tue Mar 24, 2020 4:47 pm

Hi scimifunze and welcome to the club.
First question, is the car Auto or manual?.
As #1 or #2 may be inhibitor relays for gearbox.
#3 is a suppressor for electrical noise.
#4 is voltage regulator.
#5 looks like a relay, possibly for High Beam.
#6 is the Ballest Resistor for the starter circuit, BUT it's not connected to the circuit, look next to your arrow and the Lucar connector is bare.


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Newbi - asking for clarification on electric components in engine bay SE5a

Post by David Tew » Tue Mar 24, 2020 4:51 pm

1. Relay
2. Relay
3. Suppressor (to stop interference from 4 - not really essential nowadays)
4. Instrument voltage stabiliser (gives nominal 10v)
5. Relay
6. Ballast resistor (only one end appears to be connected!)

You'll have to trace wiring to see what1, 2 & 5 feed.
Worth checking all the wiring as it looks a little suspect.


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Newbi - asking for clarification on electric components in engine bay SE5a

Post by David Tew » Tue Mar 24, 2020 4:52 pm

You're too quick Mark. :lol:


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Newbi - asking for clarification on electric components in engine bay SE5a

Post by scimifunze » Tue Mar 24, 2020 5:10 pm

He Mates,
thanks for the welcome, you really have a quick response - THANKS!
My Scimi has a T9 5-gear.

Well, may daily driver is an Merc E class w210 220 cdi - with 989.000km on the clock - this sadly has already such evil stuff like C-Bus - and a wiring loom that one may really call "suspect" ...the one on my Scimi works superfine yet, however my intention is to straiten it a little bit, where possible and clean and protect the contacts. Better safe than sorry... 8)

# 1 - RIPCA Repaults - Mini relay normally open 12V 31-40A 4-pins (that I found out - will check cable trace, maybe it is in my car for the Revotec Electric fan, that is hooked to middle console left switch, one position for automatic / temperature switch-in, next position for manual permanent switch-in )
# 3 - where can I get new ones?
# 4 - is that the exchange for it: https://www.minimania.com/Smiths_Voltage_Stabilizers
# 6 - Ballast resistor - need to check understand why only one side connected ...assume I cannot take it off !? (simplifying). May this have to do with that I have an LUMENITION opto Ignition? However - found the replacement (if sense full): www.ebay.de/itm/RELIANT-SCIMITAR-GTE-RO ... T-RESISTOR



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Newbi - asking for clarification on electric components in engine bay SE5a

Post by David Tew » Tue Mar 24, 2020 6:39 pm

scimifunze wrote:
Tue Mar 24, 2020 5:10 pm
# 4 - is that the exchange for it: https://www.minimania.com/Smiths_Voltage_Stabilizers
That would do. However, IMHO it's better to fit an electronic version as they're more accurate and reliable. In addition you don't need the supressor (#3).
AJL on this forum sells them - see HERE. Beware of the really cheap versions as they have no filtration on the supply.

Whether or not you need the ballast resistor depends on what coil is fitted.


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Newbi - asking for clarification on electric components in engine bay SE5a

Post by Rattling » Tue Mar 24, 2020 7:31 pm

Is your mercedes one of the ones with the bio-degradable engine loom .


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Newbi - asking for clarification on electric components in engine bay SE5a

Post by scimifunze » Tue Mar 24, 2020 9:07 pm

@David: Thanks super! I will order this.

@ Rattling: Even if barred from some German cities due emissions, I am of the firm opinion that this is one of the greenest cars ever (hmm, mine is black...) - because MERCEDES in their paint - & corrosion protection was light-years ahead (even from the British), the entire car is definitely bio degreable, the only thing that will remain for ever is the engine. Since the Essex was originally intended as diesel, maybe I should think about an swap :lol: ...recently I am just preparing it for TÜV (MOT) since I find it somehow a sportive challenge to do the 1mio kilometres :mrgreen:

:idea: However, now I can use the Scimi to invade such barred city since this is allowed historical cultural goods :wink:



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Newbi - asking for clarification on electric components in engine bay SE5a

Post by peter freeman » Tue Mar 24, 2020 9:34 pm

You can get your wiring diagram in colour here :- https://www.scimitarweb.co.uk/~nenoggins/Wiring.htm - why relays have been fitted you can often find out by looking at what colour wires are connected to them. The 5's did not originally have a ballast resistor fitted they used a eureka wire ( which does the same thing ) your wiring has been "played" with through the years.



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Newbi - asking for clarification on electric components in engine bay SE5a

Post by scimifunze » Tue Mar 24, 2020 10:05 pm

Dear Peter, this helps me a lot ! Thank you! Much better than in my workshop manual.



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Newbi - asking for clarification on electric components in engine bay SE5a

Post by peter freeman » Tue Mar 24, 2020 10:20 pm

note that there are three different headlight wiring configurations for the 5A's depending on the chassis numbers



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Newbi - asking for clarification on electric components in engine bay SE5a

Post by scimifunze » Fri Mar 27, 2020 10:48 am

Oh dear....,
yesterday I took out spare wheel and cover plate underneath, even if my car has "all the essential up-grades" and it is running quite fine, the electrics are everything but clean installed :cry: ...dozends of crimped plug connections, all added cabling "routed somehow", a lot flittering installed, cable and earth careless close to manifolds, some dead ends etc, etc, ... I must admit being bit frustrated right now. Will have to re- arrange / solder / clean-up the cable traces a lot... :( ...

Found another two relay (below pic):
#7 - Assume this is headlights, fog beam and horn - will check
#8 - this seems the temperature control socket for the electric Revotec cooler fan, guess the potentiometer is for adjustment of trigger temperature, the
#9 - plugged in relay - assume switching the fan in/out, or providing the dasg warning light for overheating...

Have to find out a lot which is for what - after that shall do a cleared list of what is what.

I dont like that there is literally no support at the both wiring looms left / right of the engine - thinking about having some kind of "small cable trays" or similar, yet I have no idea how-to.
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Newbi - asking for clarification on electric components in engine bay SE5a

Post by scimjim » Fri Mar 27, 2020 10:50 am

7 is the original type of relay that would have been sited by the fuse box.

Looks like your only option is to follow each system in turn and fix the “modifications”


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Newbi - asking for clarification on electric components in engine bay SE5a

Post by scimifunze » Fri Mar 27, 2020 10:57 am

Yep.
PS can I just plug off a certain relay short time for checking then what is off - without doing harm to some component, or is this a bad idea?



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Newbi - asking for clarification on electric components in engine bay SE5a

Post by willholderogri » Fri Mar 27, 2020 11:13 am

Do you mean unplug the relay ? If so you will not harm the original circuit .


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