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Posted by Doc Dave [69.19.14.30] on Monday, February 28, 2011 at 12:37:38 :
I took my power wagon "Kirkwood" out for a 20 plus mile drive yesterday. I really like having the Dennan overdrive. It really drops the rpm's down and helps with getting up to about 50 without things screaming so loud.
For those who are thinking of going this route, if you have a 6 volt system like I have, you need to modify things a bit. The Dennan overdrive has a 12 volt solenoid. Dennis Gronan told me there is no 6 volt solenoid that will fit the overdrive. 6 volts is marginal at best with it. When I used it it the first time, it would "work", but "cut out" on me at times which is very annoying. Mac and others on the forum have a solution for those with 6 volt trucks and that is get an 8 volt battery and have a generator shop adjust your voltage regulator. That is all you have to do. 8-9 volts is enough voltage to work the solenoid, and you don't have the more expensive 12 volt conversion to do if you don't want to. In my case I had just bought a brand new 6 volt batttery, so what I did is hide a 12 volt motorcycle battery behind the seat, and use it to power the overdrive, as well as power a 12 volt cigar lighter type outlet under the seat on the front seat frame, pretty much out of sight. This allows me to power a CB or cell phone charger too now. I use a battery maintainer to recharge/maintain the motorcycle battery when not driving. So far so good.
One other tip. The overdrive is mounted in rubber tranny mounts to the cross members. I did not have a good ground situation with it until I ran a separate ground strap from the overdrive to the frame rail. That solved an activation problem I had at first.
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