I have a Johnson 88 spl which is a de-contented 90. Part of the 'de-content’ing is that it does not have a voltage regulator, just a rectifier to get DC out of the system. At idle I get about 14v. As rpms rise so does voltage to a max of about 16.5v. Previously, my old VHF dealt with it just fine. But, I bought a new VHF which alarms if voltage goes over 15 volts. Obviously, I don’t want to toast my new radio.
The question, how to limit the voltage going to the radio? I have two ideas. Either, use an inexpensive voltage regulator from any electronics store or retrofit the 88spl with the regulator/rectifier off of the 90 of the same vintage. The second option is about $200 but, seems like a better idea. The next question, does anyone know if the regulator/rectifier from a 90hp of the same year is a straight swap for the rectifier on my 88spl?
17’ Henry O Hornet
26’ Palmer Scott
not sure
would have to see both motors side by side, but i would guess u will need the wiring harness from the 90
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That’s what I was afraid of. I’ve been looking over the wiring diagrams and it appears that there are a two ‘extra’ wires associated with the regulator/rectifier. But, it also appears that they may be superfluous, going to things like the VRO setup.
I guess I have a little more digging to do.
Thanks for the response.
17’ Henry O Hornet
26’ Palmer Scott
OK - so the word is that I can make a direct swap of a ‘regulator/rectifier’ off of a ‘90’ onto my ‘88’ and leave the two extra wires nicely terminated and insulated.
A request: does anyone out there have a mid-90s vintage 90hp Evinrude or Johnson? I’d like to get a few pics to see exactly how the regulator/rectifier is mounted and which wires are which. If someone with such a motor could snap a few pics and post them, I’d be forever grateful.
17’ Henry O Hornet
26’ Palmer Scott