Join Date: Oct 2010
Location: Oak Hills (Cajon Pass Summit), Ca
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47RH/NP241 swap (replacing A518/NP205) SPEED SENSOR connection HELP
I'm in the final stages of the swap and stumped by the speed sensor connection. The A518/NP205 speed sensor in the 1993 truck has a 2-wire connection whereas the 47RH/NP241 has a 3-wire connection.
1993 Two wire on the NP205: BK/LB is the common sensor return to the PCM (pin 4), and WT/OR is the 8 volts from the PCM.
1995 Three-wire on the NP241: 1-WT/OR goes to PCM pin 47 and the instrument cluster; 2-OR 8 volts from the PCM; 3- BK/LB goes to the engine speed sensor. (Note: the 93 does NOT have an engine speed sensor, just a crankshaft possition sensor)
How can I get the speedometer to work? Anybody has done a 47RH/NP241 swap in his/her 1st gen?
77 Dodge Xplorer 307 Frank Ind 26-ft 4x4 Class A Motorhome 1st Gen '93 Cummins swapped in, 47RH/NP241, stock turbo, PS intercooler, ground fuel pin, starwheel, fuel screw turned, 366 spring, BHAF, M&H DTA, 4" downpipe, DNA muffler, ARB Lockers, 17500# winch.
Last edited by ClassA4x4; 11-14-2010 at 06:51 AM.