87 jeep wrangler (617 coversion)
#221
hey im doing the same swap in my 88' but I bought the project from some guy that I guess did one before but he didn't have the time to finish the one I bought so I was hoping you could help me out!! I am having a hard time wiring up my glow plug relay...I know where the red tan red w/black stripe purple and blue w/white stripe go but there is a smaller relay thing attached to it that has 3 wires coming out of it and I have no clue where they would go to. I am also having a hard time finding the wires to hook up the alternator properly...what did you do for yours?? close up pics of the wiring for the entire motor would be a great help!!!!!!!! thanks
#222
Powerstroke,
I attached the Glow Plug schematic from the Mercedes 300 manual; it shows how to wire your glowplugs properly. Essentially, the relay is powered up all the time. On my particular install I have the glow plugs powered up manually by a spring toggle on my dash; I didn't want to take chances should the relay fail in the powered up position. In any case, can you send me a photo of your smaller relay w/three wires? Might it be the OEM cruise control?
Ref the alternator; again, I did mine differently. Charging (large gauge wire) goes directly to the battery; the other wire should go to your old battery charge light on the dash. My Ford doesn't have one; all I had to do was to wire it to my orig Ford starter solenoid (hot side, small terminals). Reason: In order for the alternator to function (charge the battery), it needs to "see" some voltage; your charging light does that by completing the circuit with the lightbulb. It is pretty simple...and confusing at the same time...once the alternator sees the voltage at the W terminal aka the small wire, it will charge. You can remove the W terminal wire and the alt will still charge which threw me. Shut down w/o wire attached=no charge. Took me a while to do the 2+2 thing. Should work fine in either case; I was told from a mercedes mechanic that either way works...12 volts is 12 volts!
Whatever you do, make sure your battery stays connected when the engine is running; some folks test voltage output by disconnecting the charge cable...burns the alternator up quickly. I don't recall how much the output is, I'm guessing around 13 to 14 volts..anything above 12 means it is charging the batt. Hope this helps and good luck!
Giacomo
I attached the Glow Plug schematic from the Mercedes 300 manual; it shows how to wire your glowplugs properly. Essentially, the relay is powered up all the time. On my particular install I have the glow plugs powered up manually by a spring toggle on my dash; I didn't want to take chances should the relay fail in the powered up position. In any case, can you send me a photo of your smaller relay w/three wires? Might it be the OEM cruise control?
Ref the alternator; again, I did mine differently. Charging (large gauge wire) goes directly to the battery; the other wire should go to your old battery charge light on the dash. My Ford doesn't have one; all I had to do was to wire it to my orig Ford starter solenoid (hot side, small terminals). Reason: In order for the alternator to function (charge the battery), it needs to "see" some voltage; your charging light does that by completing the circuit with the lightbulb. It is pretty simple...and confusing at the same time...once the alternator sees the voltage at the W terminal aka the small wire, it will charge. You can remove the W terminal wire and the alt will still charge which threw me. Shut down w/o wire attached=no charge. Took me a while to do the 2+2 thing. Should work fine in either case; I was told from a mercedes mechanic that either way works...12 volts is 12 volts!
Whatever you do, make sure your battery stays connected when the engine is running; some folks test voltage output by disconnecting the charge cable...burns the alternator up quickly. I don't recall how much the output is, I'm guessing around 13 to 14 volts..anything above 12 means it is charging the batt. Hope this helps and good luck!
Giacomo
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