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WAHK80737 Offline
#1 Posted : Tuesday, 12 April 2022 3:08:54 PM(UTC)

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After some feedback/advice. I have a HK 186S GTS Monaro restored to orignial condition. The original Bosch 35A Alternator has given up the ghost - irrepairable accoridng to auto elec ...

So to get running again until I cna find a replacement fo rthe original altenator) I've bought a Bosch BXH1238A 70A alternator.

To wire I plan to run the red 10 gauge cable that was on the old Alternator B+ terminal to the new Alternator B+ terminal (runs to the ammeter then back to starter)

Disconnect the blue/brown cable from the external voltage regulator

Connect the brown cable from that was on the original alternator (Ind/D+ terminal) to the D+ terminal on the new alternator (excites alternator, lights the ALt warning light globe on dash)

Leave blue cable that went from old alternator (DF terminal) to external voltage regulator unplugged (as external regulator now out of equation)

New Alternator grounded to engine block through mounting bolts as was old alternator

I'm sure others will have done this conversion - does the wiring sound correct?

I have +/-40 A Ammeter on dash - any concerns about overloading this if I'm using 70A alternator vs 35A? I don't have aircon fitted so nohing above std load. Should I chang eout the 10 gauge wire to a heavier wire?

I do have an arial fitted but never use it (have retrosound radio fitted and just use bluetooth connectivity)

Thanks in advance, Simon.

Update had some feedback I should bridge across the back of the ammeter also, prevent it from frying.

Wired as described above but added an 8B&S shunt across the ammeter linking B and G terminals. Had to modify my ring spanner by grinding down the OD to get it to fit over the terminal nuts - not a lot of room back there. Dummy light comes on when ignition turns on and then goes out when car started. Ammeter effectively does not work as very little current flows across it (I believe the 8B&S wire has less resistance than the ammeter). Been out driving a few times with no issues, alternator charging the battery like it should. Replaced my (old) fire extinguisher just in case .... On to getting a decent original replacement or one of mine fixed ...

Plus - thanks to some old ammeter posts in Fastlane from 10+ yrs ago for additional information!

Edited by user Monday, 18 April 2022 6:58:31 PM(UTC)  | Reason: Not specified

KBM Offline
#2 Posted : Wednesday, 13 April 2022 8:49:00 AM(UTC)

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Brown wire sounds correct, but for the safety of your amp meter I'd disconnect it from the alternator and run a temp wire directly to the battery.
 1 user thanked KBM for this useful post.
WAHK80737 on 18/04/2022(UTC)
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