SL/R129: 95 sl500 no crank
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Joined: May 2012
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1995 500SL 2003 C32 2000 S430
95 sl500 no crank
A few weeks ago I decided to see why my SL500 will not crank. I was able to get under the car and ran a jumper wire from the starter to the engine. Amazing that after sitting for the last 7 to 8 months it started. . Let it run for a few minutes. I shut it off and tried to start it again nothing, I moved the steering wheel up and down, still nothing.
I had taken the center console apart to look for the relay (the lockout relay) but could not get to it.
Anyone have suggestions?
I had taken the center console apart to look for the relay (the lockout relay) but could not get to it.
Anyone have suggestions?
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Joined: Jan 2006
Posts: 1,982
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From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
If there is no plate with the date of manufacturer on the door jamb, then I don't know where to look.
At any rate, the following tests of the ignition switch and neutral-safety switch are probably applicable to your car.
The neutral-safety switch is wired to the male half of the connector with purple and white-striped wires. To check the switch separate the connector and measure resistance between the pins associated with the switch. With the gear selector in "P" or "N" there should be a short circuit, naturally.
If the neutral-safety switch is okay, then the ignition switch is suspect. To check that you measure voltage between the purple wire at X26/12 and chassis ground while the connector is partially separated -- separated enough to probe the voltage but not so far as too lose electrical contact. With the key in position 3 (start), if the ignition switch is good there should be 12VDC.
At any rate, the following tests of the ignition switch and neutral-safety switch are probably applicable to your car.
The neutral-safety switch is wired to the male half of the connector with purple and white-striped wires. To check the switch separate the connector and measure resistance between the pins associated with the switch. With the gear selector in "P" or "N" there should be a short circuit, naturally.
If the neutral-safety switch is okay, then the ignition switch is suspect. To check that you measure voltage between the purple wire at X26/12 and chassis ground while the connector is partially separated -- separated enough to probe the voltage but not so far as too lose electrical contact. With the key in position 3 (start), if the ignition switch is good there should be 12VDC.
