Click, Click, Click - PeachParts Mercedes-Benz Forum

The Gears · #1 08-17-2016, 11:26 AM

Thanks for the info guys. The ground strap is OK because it will start fine
from the jumper on the fender junction. The click sound comes from a higher area. It sounds like a relay engaging. Thanks for ruling out the trani
lockout.

funola · #2 08-17-2016, 12:03 PM

No relay in the starter circuit. Key switch go right to starter solenoid.

The Gears · #3 08-18-2016, 07:31 PM

I have a wiring diagram of the starter system. Easy to follow.
The problem is no power FROM the lock out sw.
There is power getting TO the lock out as the backup lights come on when
in reverse with the key on.
If the lock out switch is removed is it serviceable?
Are they easy to remove?
I have my jumper coming up under the hood and into the driver side window.
Works great. turn on the key, glo and press the button.
Hope it doesn't rain.

The Gears · #4 08-19-2016, 05:19 PM

LOGIC: If the backup lights go on with the key on, selector in reverse, It is not logical that the park and reverse contacts won't function. I can see one not working but not both.
Is there a relay to do with an old anti theft setup that is in the circuit?
Very strange that one day it is OK and the next it won't start without the car being touched.

Stretch · #5 08-20-2016, 09:53 PM

Quote:

Originally Posted by rocky raccoon

Classic battery problem. If new(er) check cables at battery end first.

X2

Quote:

Originally Posted by The Gears

LOGIC: If the backup lights go on with the key on, selector in reverse, It is not logical that the park and reverse contacts won't function. I can see one not working but not both.
Is there a relay to do with an old anti theft setup that is in the circuit?
Very strange that one day it is OK and the next it won't start without the car being touched.

Check your battery - it sounds like it is struggling / not providing enough power.

The classic clicking of the starter solenoid (but no spinning of the starter motor) as mentioned above points to this.

The reason why not enough "juice" is getting to the starter could also be due to dirty contacts.

Taking it one step further: Over on BW there was a fairly recent fad of "change your battery cables as they tend to corrode inside"...

funola · #6 08-21-2016, 10:50 AM

Quote:

Originally Posted by The Gears

LOGIC: If the backup lights go on with the key on, selector in reverse, It is not logical that the park and reverse contacts won't function. I can see one not working but not both.
Is there a relay to do with an old anti theft setup that is in the circuit?
Very strange that one day it is OK and the next it won't start without the car being touched.

There are multiple contacts in the NSS. Park, reverse, neutral maybe separate contacts. Just because reverse contact is ok does not mean park and neutral is also ok.

If you want to jumper the NSS, best place to do it is at C146 above the accelerator pedal (pins 3 & 4 of 4 pin connector, 2.5 vi/wt and 2.5 vi)

The Gears · #7 08-21-2016, 08:03 PM

Quote:

Originally Posted by funola

There are multiple contacts in the NSS. Park, reverse, neutral maybe separate contacts. Just because reverse contact is ok does not mean park and neutral is also ok.

If you want to jumper the NSS, best place to do it is at C146 above the accelerator pedal (pins 3 & 4 of 4 pin connector, 2.5 vi/wt and 2.5 vi)

Hi Funola. Thanks for your great info. How do I access the C146 above the throttle pedal. Were do you get that number from? Wish I had your info and now how

funola · #8 08-21-2016, 09:13 PM

Quote:

Originally Posted by The Gears

Hi Funola. Thanks for your great info. How do I access the C146 above the throttle pedal. Were do you get that number from? Wish I had your info and now how

Info is from the electrical trouble shooting manual of the FSM. You have to take the knee panel off to access C146. If you go to the key switch and follow the 2.5 VI/WHT wire, it should go to a single pin connector, then to C146