Hello fellow S2SBs (Seadoo 2 Stroke Boaters)
Helping out my brother-in-law with his "new" 1997 Seadoo Challenger with the single 787 engine.
MPEM is behaving very strangely;
I could not find any references to anyone using an aftermarket MPEM in a Seadoo boat, but I see no reason why it would not work with the 787 in the Challenger, am I missing something?
Helping out my brother-in-law with his "new" 1997 Seadoo Challenger with the single 787 engine.
MPEM is behaving very strangely;
- At power on, you can hear a relay click on the MPEM, and power is supplied to gauges immediately,
- Even after 33 seconds, sometimes, the power is still present, i.e. the timer to save battery power does not kick in and turn off the gauge power,
- If the key is placed on the post, sometimes you will receive two beeps, sometimes just one,
- cleaned and checked the DESS post all the way back to the wires going into the MPEM, all good, reed switch in the post is good and consistent, so the post has NOT been replaced,
- If two beeps are heard, the engine will usually start after a few seconds of cranking, can run for a few secs or even up to you push the stop button or pull the key,
- when it does quit on its own, it seems as if you have pushed the stop or pulled the key, power stays on the gauges, but will no longer beep or crank, even if the key is removed and replaced, no beep,
- Need to remove power to the battery for a few mins and try again, if the relay click is heard it is usually good to try again, but sometimes no click is heard,
- Cleaned and checked all cables and wires (connectors and 0 ohms resistance in wires), confirmed good grounds and no corrosion,
- All fuses are good, no blown ones, just to be safe, put known good fuses on the MPEM,
- Ran new positive and ground wires from battery direct to MPEM,
- Tried multiple keys,
- All the pins and connectors for the large plug going to MPEM have been cleaned as well,
- Seems to be more intermittent when it is cooler, more stable when it is warmer,
- Beginning to think there is a faulty component in the MPEM power supply, but the unit is not welcoming to component surgery due to all the potting/epoxy encasing it. I have no reluctance to perform component repair, as I have done so on many older circuit boards, this one just has the challenge of the epoxy on everything,
- There are services which will take an MPEM from a PWC with the 787 engine and adapt it to work on the Challenger, but those are about 1K USD,
- Considering finding a used 787 MPEM from a 1997 GTX (~500USD), adding the connectors to match the Challenger harness, or . . . perhaps one of the ArielTek SD287s which is an aftermarket MPEM for 787s (~300USD) and adapting it for the boat.
I could not find any references to anyone using an aftermarket MPEM in a Seadoo boat, but I see no reason why it would not work with the 787 in the Challenger, am I missing something?
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