Does anyone know if a similar year gasser cruise amplifier will work in place of the Diesel one? Or for that matter, what else can swap with the SDL one? I read the 81-85 SDs can, can 90-91 350SD/L work too?

My local JY just acquired two very clean 420s ('86 and '87) and both have newish cruise amps, but still the early 14 pin design without the coding end plug thing. Plus pile of SDs.

If this plays out wrong, I will just go Programma or GDL.



My SDL finally has an entire new front end and new tyres... so it is now my long distance freeway car, so having working cruise would be a big plus.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

Depends on what they use for a speed sensor. Gasser tach amps would be unlikely to work in a diesel.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

since speed is determined by the transmission output, I don't see why it wouldn't work. the speedometers work in our cars. it's possible they would be calibrated for a taller rear gear ratio though...

The taller ratio would only cause the cruse to have a higher minimum speed threshold. If the speed sensors ( the pick up signal generator) are the same, the unit wont know what sort of car its in.

__________________
Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

This is sort of a non answer; I have done it, but. The module I got from the junkyard is the later version with the coding plug. I did not change the coding plug to the SDL version, BTW there is a list of coding plugs in the 126 manual, but there is no table of car model numbers vs coding plug numbers. Anyway to cut to the chase, the unit works, but cuts out, mainly on level sections of road. This leads me to believe that the problem is due to the wrong coding plug, because the gas and diesel cars have different power characteristics.

^ Often times that is an indication of a failing amp.

The pic shows the amp, control unit, for a 126.125, an SDL. And a cross reference.

Attached Thumbnails

 

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83 SD

84 CD

Anyone have an idea of the price of the coding plug?

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

I heard they are NLA, but you should be able to transfer the one over from your dead amp.

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

My SDL did not have an external coding plug.

Looks like I am going to have to break down like my LeFever and purchase a newly reman unit.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]