I have a challenger 1800 "98" with twin 110s. Sat for 2 years and I expected the battery to be shot so I bought and installed a new one. Now I cant get it to even hardly aknowlledge it even has a battery. Lanyard does not beep, push starter 5 times on both engines with and without lanyard and get nothing. Gauges show nothing but blower, bilge and lights all work. I have checked all fuses (I believe) crossed the solenoids on both engines and starters engaged. Have not jumped it because I had to replace the computer board ($1800) 6 years ago when I bought it used and was told that is what blew the board the first time. What's next?
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Boat was winterized and was running perfect and now has an electrical issue
- Thread starter Rogerb
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jhjesse
Well-Known Member
No beeps...nothing except accessories.
Hmmm, I'm leaning towards the MPEM not being able to read the lanyard. Might check the dess post first. They are known to go bad.
If it is not the dess post, maybe the MPEM is not reading the lanyard. It will then need to be reprogrammed, or a new one reprogrammed. JMTC.
Hmmm, I'm leaning towards the MPEM not being able to read the lanyard. Might check the dess post first. They are known to go bad.
If it is not the dess post, maybe the MPEM is not reading the lanyard. It will then need to be reprogrammed, or a new one reprogrammed. JMTC.
Have you researched this thread? https://www.seadooforum.com/showthread.php?45694-Unofficial-587-657-717-Mpem-troubleshooting-guide
steve on the water
Member
I am having the exact same issue with my 97 Challenger 1800. Correcting a bad ground got me to where I have good advanced diagnostics but still no spark for either engine. I am leaning toward a bad MPEM at this point but am having a hard time putting that much money into the boat at this time. Good Luck and keep us posted on what you find.
jhjesse
Well-Known Member
Copied this from a previous thread.
Hope it helps.
DESS TESTING
The Mpem, (Multi Purpose Electronic Module) needs to beep 2 times to let you know it is ready to start. Clean the post and cap with soapy water. Don't use any grease of lubricant on it as it needs a clean connection to make contact. Connect the lanyard to see if it is making a connection. 2 beeps and it's ready to fire up.
Engine start/stop switch verification;
Disconnect the Yellow/Red wire of the start/stop switch. Using an ohmmeter, connect test probes to the Yellow/Red wire and to ground. Measure resistance, it must be an open circuit (switch is normally open). Depress and hold switch, the ohmmeter should read close to “0” ohm.
Safety Lanyard Switch Verification;
If 2 short beeps are not heard when installing the safety lanyard, disconnect the switch wires.
Safety lanyard removed;
connect the test probes to switch Black and Black/Yellow wires. It’s an open circuit, there should be no continuity.
Connect one test probe to the White/Gray wire and the other test probe to the switch terminal. Measure resistance, it should be “0” ohm. Connect one test probe to the Black wire and the other test probe to the switch ring. Measure resistance, it must be close to “0” ohm.
Safety lanyard on switch; connect the probes to switch Black and Black /Yellow wires. Measure resistance, it must be “0” ohm.
Timer Verification;
The timer is integrated into the MPEM. Always confirm that the fuses are in good condition. To confirm operation of timer, remove the safety lanyard from switch. After 5 seconds delay, depress start/stop button once. The timer should stay on for 33 seconds (for example, the gauge(s) will be activated) and than turn off.
DESS codes. It is possiable that you are getting a mixed code.
DESS Codes/ Beeps
2 Short beeps …the engine is ready to start
1 Long beep …no communication to MPEM
4 Short beeps… (on Jet Boats) Shifter is in gear
8 Short beeps…defective MPEM
1 Continual beep…engine over heating
Advanced Self- Diagnostic Mode
By pushing the start/stop button 5 times, you’re putting the DESS in advanced diagnostics. When you have successfully done this, you'll hear 1 short, 1 long beep then, put on the lanyard cap. The engines should start if everything is ok.
2 Short beeps means MPEM can’t read the lanyard cap or it has bad magnet. It could be a bad wire connection at the Lanyard switch.
2 Long beeps means wrong lanyard or bad connection of DESS connection
3 beeps signal the wiring harness of the DESS switch are grounded, or a short circuit somewhere.
You may have a bad connection in your wiring harness, from corrosion. Go through your electrical systems connectors and check for corrosion. Clean them with some contact cleaner, then die-electric grease.
To listen to the codes again start from the beginning.
Hope it helps.
DESS TESTING
The Mpem, (Multi Purpose Electronic Module) needs to beep 2 times to let you know it is ready to start. Clean the post and cap with soapy water. Don't use any grease of lubricant on it as it needs a clean connection to make contact. Connect the lanyard to see if it is making a connection. 2 beeps and it's ready to fire up.
Engine start/stop switch verification;
Disconnect the Yellow/Red wire of the start/stop switch. Using an ohmmeter, connect test probes to the Yellow/Red wire and to ground. Measure resistance, it must be an open circuit (switch is normally open). Depress and hold switch, the ohmmeter should read close to “0” ohm.
Safety Lanyard Switch Verification;
If 2 short beeps are not heard when installing the safety lanyard, disconnect the switch wires.
Safety lanyard removed;
connect the test probes to switch Black and Black/Yellow wires. It’s an open circuit, there should be no continuity.
Connect one test probe to the White/Gray wire and the other test probe to the switch terminal. Measure resistance, it should be “0” ohm. Connect one test probe to the Black wire and the other test probe to the switch ring. Measure resistance, it must be close to “0” ohm.
Safety lanyard on switch; connect the probes to switch Black and Black /Yellow wires. Measure resistance, it must be “0” ohm.
Timer Verification;
The timer is integrated into the MPEM. Always confirm that the fuses are in good condition. To confirm operation of timer, remove the safety lanyard from switch. After 5 seconds delay, depress start/stop button once. The timer should stay on for 33 seconds (for example, the gauge(s) will be activated) and than turn off.
DESS codes. It is possiable that you are getting a mixed code.
DESS Codes/ Beeps
2 Short beeps …the engine is ready to start
1 Long beep …no communication to MPEM
4 Short beeps… (on Jet Boats) Shifter is in gear
8 Short beeps…defective MPEM
1 Continual beep…engine over heating
Advanced Self- Diagnostic Mode
By pushing the start/stop button 5 times, you’re putting the DESS in advanced diagnostics. When you have successfully done this, you'll hear 1 short, 1 long beep then, put on the lanyard cap. The engines should start if everything is ok.
2 Short beeps means MPEM can’t read the lanyard cap or it has bad magnet. It could be a bad wire connection at the Lanyard switch.
2 Long beeps means wrong lanyard or bad connection of DESS connection
3 beeps signal the wiring harness of the DESS switch are grounded, or a short circuit somewhere.
You may have a bad connection in your wiring harness, from corrosion. Go through your electrical systems connectors and check for corrosion. Clean them with some contact cleaner, then die-electric grease.
To listen to the codes again start from the beginning.
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